site stats

Red canvas tarps

WebRed Poly Tarps. Orange Poly Tarps. Yellow Poly Tarps. Green Poly Tarps. Silver Fire Retardant Tarps. White Fire Retardant Tarps. Light Duty Poly Tarps. Canvas Tarps. Tan Canvas Tarps. ... We cover a wide range of poly tarps, canvas tarps, mesh tarps and heavy duty tarps. Order Online and Save! For Special Inquiry Call Toll-Free: 1-800-838-3057. WebCanvas Truck Tarps; Car Cover; Hi Lift Tarps / Hydra Tarp; Lightweight Tie down Tarps; Quad Bike & Motorcycle cover; Road Train Tarps; Rubbish Tarp; Skip Bin Tarps ... Grey, Red. Product Size In Meters: 7.5 x 2.4, 8 x 2.4, 9 x 2.4, 10 x 2.4, 11 x 2.4. Related products. PVC Box Cover. Australian Made Box Covers manufactured with the highest ...

Looking for a new microscope – Wicked Edge …

WebTarps have a wide variety of uses and come in different sizes and materials. Maybe you're worried about a leaking roof after a storm or you need to protect your car because the moon roof won't close. Maybe you're doing some painting or DIY in your home and need to protect your items. Whatever the reason is, a 24' x 24' Tarp is a great investment! WebBlue Canvas Tarps Water Resistant 12 Oz. White Canvas TarpsWater Resistant 10 Oz. Green Canvas Tarps Water Resistant 10 Oz. Brown Canvas Tarps Water Resistant 10 Oz. Gold Canvas Tarps Water Resistant 10 Oz. Natural Canvas Tarps Untreated 10 Oz. Olive Drab Canvas Tarps Water Resistant 12 Oz. Olive Drab Canvas Tarps With D-Rings 12 Oz. 2 3-二溴-1 4-丁烯二醇 https://amgsgz.com

Amazon.c knife burr microscope WebThe diagram below shows the burr projecting from the edge of the knife: The next diagram shows the formation of a burr in greater detail. To draw a burr, simply sharpen one side of the knife at a time. If this is the first time the knife has been sharpened in a Wicked Edge, we recommend using your 200 grit stone to draw the burr. https://support.wickededgeusa.com/portal/en/kb/articles/drawing-a-burr How Chipping of Edges Happens at a Microscopic Level WebMay 28, 2024 · For example, a knife edge sharpened to rougher finishes will have larger scratches than a finely sharpened edge, and these scratches can be thought of as pre-existing flaws [1]: Fracture is measured in terms of K, or “stress-intensity factor” which is the stress at the crack tip. K is proportional to the stress and the square root of the ... https://knifesteelnerds.com/2024/05/28/chipping-of-edges/ What is Stropping? Knife Sharpening Step 3 - Work … WebJun 10, 2024 · Knife Sharpening Step 3. Stropping is probably one of the most mythologized (and mystifying) parts of the sharpening process. Everyone knows they are supposed to do it, some people have a belt they … https://www.worksharptools.com/what-is-stropping-knife-sharpening-step-3/ I Purchased a $13 Microscope from Amazon - BladeForums.com WebJul 8, 2024 · If I create a burr with a heavy grit stone I dont even need the microscope part just the light to see it. You should easily be able to feel it too. When you move to fine grits or the strop thats when the microscope is useful because it's tuff to see that tiny wire burr with your naked eye. https://www.bladeforums.com/threads/i-purchased-a-13-microscope-from-amazon.1872125/page-3 Burr detection and classification using RUSTICO and WebNov 1, 2024 · A microscope camera captures the RGB images provided by the boroscope with a resolution of 2592 × 1994 pixels. ... It indicates that the burr breakage (B) and knife … https://www.sciencedirect.com/science/article/pii/S1877750321001538 Seeing the edge and burr with microscope : r/knifemaking … WebI just bought a cheap usb microscope and it's amazing for looking at your edges. You can see the burr clear as day on some of these images. This was further back on the edge … https://www.reddit.com/r/knifemaking/comments/pde3gq/seeing_the_edge_and_burr_with_microscope/ How do I check for a burr? - Sharpening Supplies WebTo feel for a burr, gently place your thumb on the side of the blade opposite to the side that was in contact with the sharpening stone. Then slide your thumb away from the edge. … https://www.sharpeningsupplies.com/How-do-I-check-for-a-burr-W223.aspx Seeing the edge and burr with microscope : r/knifemaking - Reddit WebGo to knifemaking r/knifemaking• Posted by sideh Seeing the edge and burr with microscope I just bought a cheap usb microscope and it's amazing for looking at your edges. You can see the burr clear as day on some of these images. This was further back on the edge where I hadn't stropped it properly. https://imgur.com/a/gPCHJMq https://www.reddit.com/r/knifemaking/comments/pde3gq/seeing_the_edge_and_burr_with_microscope/ How to Establish a Burr on the Edge of your Knife WebThis is the most important part of sharpening a knife. Establishing a burr is the key indicator to inform you that you are ready to move on to a finer grit. ... https://mtknives.net/2024/01/establish-burr-knife/ microscope for viewing knife edges? BladeForums.com WebFeb 19, 2007 · That QX5 digital scope does a decent job for knives, as you can see, but you probably wouldn't keep it near your stones. A geologist's hand lens of 10x-20x is really the … https://www.bladeforums.com/threads/microscope-for-viewing-knife-edges.455045/ Knife Burrs: All You Need to Know - HDMD Knives Blog WebAug 22, 2024 · To raise a burr (s) effectively, you should: Sharpen your knife blade on one side for 5 strokes Feel that a burr is developing with your thumb Switch to the other side … https://blog.hdmdknives.com/knife-burr.html Microtomy chp 8 histopath Flashcards Quizlet WebThe process by which processed tissue most commonly paraffin embedded tiasue is trimmed and cut into uniformly thin slices or sections to facilitate studies under microscope Essential parts of microtome 1.Block holder 2.Knife carrier and knife 3.Pawl, Ratchet Feed and adjustment screws Honing (hard sharpening) types of hones Belgium yellow Arkansas https://quizlet.com/194791577/microtomy-chp-8-histopath-flash-cards/ Sharpening Made Easy: A primer on knife sharpening - Chapter 1 WebAnalysis with an electron microscope (2) has confirmed that wood cutting ability is correlated to edge smoothness. ... A major knife maker tests sharpness on nylon paint brushes. ... Testing by shaving can be misleading if the blade has a burr or wire edge. Steel naturally forms a burr - a thin bendable projection on the edge - during the ... https://sharpeningmadeeasy.com/knives1a.htm 2 x Bright Instrument Misc Knife Microtome Blades Lab eBay WebFind many great new & used options and get the best deals for 2 x Bright Instrument Misc Knife Microtome Blades Lab at the best online prices at eBay! Free shipping for many products! https://www.ebay.com/itm/266212929897 Precision Deburring - Comco Inc WebPrecision deburring is the removal of sharp particles or edges often left on parts as a result of machining operations. MicroBlasting delivers pinpoint accuracy that allows you to … https://www.comcoinc.com/deburring/ Raising a burr – Wicked Edge Precision Knife Sharpener WebApr 25, 2024 · By the 1500 grit the burr would be unnoticeable without the USB microscope. I remove each burr by applying edge leading alternating strokes. I don’t look at the burr … https://knife.wickededgeusa.com/forums/topic/raising-a-burr-3/ How To Raise a Burr On A Knife - Work Sharp Sharpeners WebMay 27, 2024 · The burr is formed as you push the knife across the surface of your sharpening device or pull the sharpening device across your knife. As you do this, steel is moved out to the end of the edge bevel. You will be … https://www.worksharptools.com/how-to-raise-a-burr-on-a-knife/ Precision Deburring - Comco Inc WebTraditionally, these burrs are removed by hand using picks and knives under a microscope by highly skilled operators. Since PEEK is an expensive raw material, any slip of the hand results in a costly mistake. MicroBlasting cuts down on time and eliminates most of the risk associated with deburring PEEK. https://www.comcoinc.com/deburring/ sharpening under the microscope the burr - YouTube WebOct 28, 2024 · Sharpening Systems and Edges Under Microscope 5.7K views Streamed 10 months ago Sharpening - the burr under the microscope Why Some People Should Never … https://www.bing.com/ck/a?!&&p=4219149227446afaJmltdHM9MTY4MTUxNjgwMCZpZ3VpZD0xZDgzZjU0Yy03MDA3LTY1ODUtMWY2Yy1lN2I4NzEyYjY0ZTImaW5zaWQ9NTIxMw&ptn=3&hsh=3&fclid=1d83f54c-7007-6585-1f6c-e7b8712b64e2&psq=knife+burr+microscope&u=a1aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g_dj1pb1Y3Qm1WMHRSZw&ntb=1 Looking for a new microscope – Wicked Edge Precision … WebDec 18, 2024 · This allows me to sharpen a knife without the need to create a large burr detectable by finger touch. It may save some blade metal over the life of the knife. By visually monitoring the scratch pattern I am able to … https://knife.wickededgeusa.com/forums/topic/looking-foe-new-microscope/ Boy’s Junk Drawer Lot baseball cards, knife, toys, microscope , misc WebFind many great new & used options and get the best deals for Boy’s Junk Drawer Lot baseball cards, knife, toys, microscope , misc at the best online prices at eBay! Free shipping for many products! https://www.ebay.com/itm/256042419329 what loupe / magnification tool do you use to see the knife edge and burr? WebOct 6, 2014 · Oct 6, 2014. #5. I use a bunch of loupes from 12-15x. Is perfect for inspection and burr removal. I would be leery of buying a microscope for close inspection unless it be very high powered. It is easy to misinterpret what one is seeing at moderate magnification if one is trying to determine true edge effects instead of cosmetics/macro effects ... https://www.bladeforums.com/threads/what-loupe-magnification-tool-do-you-use-to-see-the-knife-edge-and-burr.1225047/ Burr Removal – How to Achieve it - Sharp Pebble WebMay 28, 2024 · Burr is essentially the worn-out metal, which we remove from both sides of the primary edge through the act of sharpening. Proper burr formation tells us if the knife is being sharpened properly. Secondly, burr formation lets you gauge if you have the proper thinness of the blade. Why is burr removal important? https://sharppebble.com/blogs/blogs/burr-removal-how-to-achieve-it My knife edge under the microscope (does deburring with... WebJan 7, 2016 · 1) sharpen right side, raise a burr on left side 2) sharpen left side, raise a burr on the right side 3) Lighten up on the pressure and do edge trailing (stropping) strokes on this 1k stone. There's a JKI playlist showing this but using like a J … https://www.cheftalk.com/threads/my-knife-edge-under-the-microscope-does-deburring-with-cork-really-work.88244/ Burr Knife Sharpening: What Is A Burr, How To Feel and … WebWhat Does Burr Mean When Sharpening A Knife? When sharpening a knife, one can expect burr formation. The burr is the strip of steel or metal material that stands on the opposite … 1. Place the knife’s cutting edge on the tip of your tongue. 2. Feel the edge of the … When the knife is sharp, preparing ingredients is a breeze and cooking is … Blog - Burr Knife Sharpening: What Is A Burr, How To Feel and Remove It GoSharpening is NYC’s favorite blade sharpening service. Transform your dull … The Anatomy of a Knife - Burr Knife Sharpening: What Is A Burr, How To Feel … Search for: About; Contact; Login ; Login How Often Should You Sharpen Knives - Burr Knife Sharpening: What Is A Burr, … What Is The Difference Between Knife Sharpening and Knife Honing? … https://gosharpening.com/burr-knife-sharpening/ r/chefknives - Burr: how does it look/feel and how do I know if I ... Websharpening a knife will cause a burr to form, because the rate of deformation will at some point exceed the rate of abrasion. the burr is a tiny sliver of steel, that the stone could abrade before it bent. so to check for a burr means to feel for that folded over steel. https://www.reddit.com/r/chefknives/comments/64djjx/burr_how_does_it_lookfeel_and_how_do_i_know_if_i/ MODULE Microtome - National Institute of Open Schooling WebFrom there the tissue can be mounted on a microscope slide, stained with appropriate aqueous dye(s) after prior removal of the ... knife blade is the edge at the upper end of the trough of water. Fig. 9.5: ... Stropping - The purpose of stropping is to remove the “burr” formed during honing and to polish cutting edge. https://www.nios.ac.in/media/documents/dmlt/HC/Lesson-09.pdf Suggest a microscope for examining my edge WebJun 5, 2024 · A stereo or dissecting microscope is by far the most useful for sharpening (and working with small parts and removing slivers). My second choice would be a 10x … https://www.bladeforums.com/threads/suggest-a-microscope-for-examining-my-edge.1665326/ Knife Burrs: All You Need to Know - HDMD Knives Blog WebAug 22, 2024 · Sharpen your knife blade on one side for 5 strokes. Feel that a burr is developing with your thumb. Switch to the other side of the blade and sharpen for another 5 strokes on that side. Continue sharpening until you can feel an even and consistent burr along the whole length of the knife edge. Once that even burr is identified, flip over to the ... https://blog.hdmdknives.com/knife-burr.html Anyone who uses a magnifier to see the burr etc. why can’t I WebIf you're really having a hard time feeling a burr, you can use a cotton ball or a q-tip, something with very fine fibers, and run it parallel along the edge bevels. If there's a burr, it … https://www.reddit.com/r/sharpening/comments/ky44qo/anyone_who_uses_a_magnifier_to_see_the_burr_etc/ How to Test the Sharpness of Your Knife Knife Depot WebDec 13, 2024 · Probably the most tried and true method is the good ol’ fashioned paper test. Grab a piece of paper, hold it between your fingers, and slide the knife downward. If it’s … https://blog.knife-depot.com/best-ways-to-test-your-knifes-sharpness/ Creating a burr – Wicked Edge Precision Knife Sharpener WebDec 29, 2024 · A burr formed while sharpening is a telltale indicator that your sharpening efforts have been thorough, correct, effective and you’re reaching or apexing the knife edge. It’s is said by some sharpeners that it’s only necessary to create or draw this burr with the very first grit in your sharpening progression. https://knife.wickededgeusa.com/forums/topic/creating-a-burr-2/ Dull blade, back to life- Microscope Analysis before/after WebJoin me as I attempt to bring an extremely dull pocket knife blade back to a paper slicing edge using the Spyderco Sharpmaker. I am a novice knife sharpener ... https://www.bing.com/ck/a?!&&p=4d0659e80ba10436JmltdHM9MTY4MTUxNjgwMCZpZ3VpZD0yY2M4MGZjMS0xYzhkLTYyZTYtMGFhZi0xZDM1MWQ5YTYzODcmaW5zaWQ9NTM5NQ&ptn=3&hsh=3&fclid=2cc80fc1-1c8d-62e6-0aaf-1d351d9a6387&psq=knife+burr+microscope&u=a1aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g_dj1OeTBCaThGWGNoSQ&ntb=1 Celestron - 5 MP Digital Microscope Pro - Amazon.com Web20X to 200X MAGNIFICATION: Ideal for observing 3D specimens in stunning detail. Examine coins, stamps, rocks, insects, and more. USE WITH OR WITHOUT THE STAND: A 4-foot … https://www.amazon.com/Celestron-Handheld-Digital-Microscope-Pro/dp/B00CMJ1I08 How To Raise a Burr On A Knife - Work Sharp Sharpeners https://www.worksharptools.com/how-to-raise-a-burr-on-a-knife/ How to Sharpen Kitchen Knives Cook WebMar 9, 2016 · Step 1. To safely use a steel, hold it vertically with the tip firmly planted on the counter. Place the heel of the blade against the tip of the steel and point the knife tip slightly upward. Hold the blade at a 15-degree angle away from the steel. https://www.americastestkitchen.com/cooksillustrated/articles/218-how-to-sharpen-kitchen-knives Looking for a new microscope – Wicked Edge … WebDec 18, 2024 · I usually spot check along the knife edge at 5 or 6 positions and the tip, then switch around to the opposite knife side, and repeat. I hold the scope’s plastic shroud flat on the knife bevel then focus the outer ring … https://knife.wickededgeusa.com/forums/topic/looking-foe-new-microscope/ The Burr: What is it and Why it’s Important - Lansky WebAug 30, 2013 · A burr is a (plastic like) deformation of metal at the apex of the cutting edge. In other words, the burr is a small fold of metal on the other side of the edge you are grinding. Raising a burr lets you know that you have ground the edge thin enough on one side, to create a single plane of the bevel all the way to the edge. https://lansky.com/index.php/blog/burr-what-it-and-why-its-important/ Knife Sharpening Under the Microscope – ProSharpeningSupply WebOct 20, 2024 · Knife Sharpening Under the Microscope Let's take a look at what is happening to the edge of a knife's blade as we sharpen with a SUPER STROP Knife Sharpening Belt … https://prosharpeningsupply.com/blogs/knife-tool-sharpening/knife-sharpening-under-the-microscope Burr detection and classification using RUSTICO and WebNov 1, 2024 · It indicates that the burr breakage (B) and knife-type (K) cases, which are the two main types of edge finishing, are well detected by the proposed method. However, saw-type (S) burrs sometimes are erroneously determined as knife-type when the imperfections are really subtle. Download : Download high-res image (245KB) https://www.sciencedirect.com/science/article/pii/S1877750321001538 Burr Smith WebSep 6, 2024 · The knife sharpening guide by Burr Smith is among the most effective and trusted. It gives easy to follow instructions on sharpening any knife to a razor-sharp or hair-splitting edge. You can learn how to do the work effortlessly without undergoing excessive costs on expensive specialized equipment. https://www.johnnyskitchen.us/reviews/burr-smiths-guide-to-knife-sharpening.html Burr detection and classification using RUSTICO and image https://www.sciencedirect.com/science/article/pii/S1877750321001538 Finding the burr on a compound microscope with a lit mechanical … WebApr 18, 2024 · Its probably from packing bowls all these years and smashing hot cherries down. Regardless, I have a $40 usb microscope and a $140 Celestron USB 5mp … https://www.kitchenknifeforums.com/threads/finding-the-burr-on-a-compound-microscope-with-a-lit-mechanical-stage.52975/ Sharpening knife - S30V - observation in the … WebSharpening knifeTormek T7 https://www.bing.com/ck/a?!&&p=b9b135695afae8f1JmltdHM9MTY4MTUxNjgwMCZpZ3VpZD0xZDgzZjU0Yy03MDA3LTY1ODUtMWY2Yy1lN2I4NzEyYjY0ZTImaW5zaWQ9NTU2MQ&ptn=3&hsh=3&fclid=1d83f54c-7007-6585-1f6c-e7b8712b64e2&psq=knife+burr+microscope&u=a1aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g_dj1SY19UMmp6bWg0QQ&ntb=1

WebRed tarps can be used as part of a triage set, decorating for holidays, shade covering or protecting an object or your space. Swatch samples available upon request. 3.3 ounces … WebShop for Tarps at Tractor Supply Co. Buy online, free in-store pickup. Shop today! WebCanvas Tarps - Heavy Duty Cotton Canvas Tarp18 oz. Per Square Yrd. - Heavy Duty Thread Gage. 100% Duck cotton canvas. Double stitched sides for extra strength. 12oz before treatment, 18oz after treatment. Silicon treated for water, mildew, and weather resistance. Available in brown, green, olive drab, and tan. 2 3-二甲基-1-苯基-1-戊烯

Burr Knife Sharpening: What Is A Burr, How To Feel and …

Category:Heavy Duty Tarps - Lowest Price - TarpsPlus.com

Tags:Red canvas tarps

Red canvas tarps

what loupe / magnification tool do you use to see the knife edge and burr?

WebTarp Material: Canvas Show 6 Results Tarp Material: Canvas Stansport 6-ft x 8-ft Green Standard Canvas 1-mil Tarp Model # S-68 Find My Store for pricing and availability Altocraft 12-ft x 20-ft Green Standard Canvas 5-mil Tarp Model # WSL31 Find My Store for pricing and availability Stansport 7-ft x 5-ft Green Standard Canvas 1-mil Tarp WebCustom Canvas Tarps: Treated: water resistant or flame retardant 10 oz/sq.yard, water, mildew and rot resistant, choice of 2 colors: Mustard Tan, Natural White 12 oz/sq.yard, water, mildew and rot resistant, choice of 3 …

Red canvas tarps

Did you know?

WebThe heavy duty tarps are highly recommended for agricultural, industrial and commercial sectors. These tarps are manufactured with strength and resistance to demanding work and severe weather conditions. So for jobs that need tougher tarps, choose from our line of heavy-duty tarps. Our heavy duty tarps are often used for the following: WebNorthern Tool carries a large selection of tarps, canopies and shelters including: canvas tarps and pvc tarps to help maximize your outdoor space, ag shelters to help shield your livestock from the elements, and instant garages to protect your vehicles from nature's unpredictable weather, among many others.

WebCanvas Tarps - The Red Tent Company Strong Canvas Shelters, uniquely handmade for you Canvas Tarps Canvas Tarp khaki green 2m x 3m Canvas Tarp khaki green 2m x 3m … WebDec 7, 2024 · Canvas tarps are constructed using highly breathable materials that allow the passage of air through individual fibers. Canvas tarps can be treated or untreated. Treated canvas tarps offer resistance to water, mildew, and UV rays while untreated canvas tarps do not offer complete waterproofing.

WebTreated Canvas Tarps. 16 oz. Canvas Tarps; 18 oz. Canvas Tarps Fire Retardant Canvas Tarps in Olive Drab. Tear-resistant tarps: Vinyl Tarps - Waterproof + rip- and tear-resistance; Iron Horse Polyester Tarps - Waterproof + ultra strong; Light-duty tarps: Mesh Tarps - Breathable; Poly Tarps - Short-term use; UC-0507-SL10 WebDec 7, 2024 · Canvas tarps are constructed using highly breathable materials that allow the passage of air through individual fibers. Canvas tarps can be treated or untreated. Treated …

WebWaterproof Canvas Fabric by the Yard and Roll. Starting at: $10.95. 10oz Untreated Natural Canvas - 60" Wide x 1 Yard. $5.95. 10 oz Untreated Natural Canvas (60" Width x 100 Yard Roll) $399.95 As low as $319.96. # 4 Natural Cotton Canvas Duck (60" Width x 100 Yard Roll) $1,149.95 As low as $919.96.

WebSpecializes in red tarp - super heavy duty poly tarpaulin. High quality tarps at wholesale prices. Specializes in red tarp - super heavy duty poly tarpaulin. ... We cover a wide range of poly tarps, canvas tarps, mesh tarps and heavy duty tarps. Order Online and Save! For Special Inquiry Call Toll-Free: 1-800-838-3057. To order tarps outside of ... 2 314 × 6WebCCS’s line of Vinyl Tarps are waterproof. As an industrial strength tarp, Vinyl Tarps are tear, rip & mildew resistant. They also resist oil, acid, and grease. Vinyl Tarps are made to resist … 2 3-二甲基-2-丁醇结构式WebTarps Now manufactures large tarps and extra large tarps to cover anything and everything from heavy equipment to fields. Browse now! ... Blue Canvas Tarps - Waterproof Canvas Tarps. Starting at: $64.99. Black Waterproof Canvas Tarps. ... Red Heavy Duty Poly Tarps. Starting at: $15.99. Heavy Duty 10 Mil Silver / Black Poly Tarps . Starting at: ... 2 3d 打印流程有哪些WebTreated Canvas Tarps - Water-resistant & Breathable. Vinyl Tarps - Industrial Strength & 100% Waterproof. Mesh Tarps - Privacy & Breathable. Poly Tarps 33 % OFF 5'x7' Blue Poly Tarp 15 % OFF 6'x8' Blue Poly Tarp 49 % OFF 6'x8' Brown/Green Poly Tarp 44 % OFF 8'x10' Blue Poly Tarp 51 % OFF 6'x8' Camouflage Poly Tarp 50 % OFF 2 3-二羟基丁二酸有多少旋光异构体WebRed Poly Tarps. Orange Poly Tarps. Yellow Poly Tarps. Green Poly Tarps. Silver Fire Retardant Tarps. White Fire Retardant Tarps. Light Duty Poly Tarps. Canvas Tarps. Tan Canvas Tarps. ... We cover a wide range of poly tarps, canvas tarps, mesh tarps and heavy duty tarps. Order Online and Save! For Special Inquiry Call Toll-Free: 1-800-838-3057. 2 30-1 16進数WebCanvas Tarps Tarp Supply offers industry-standard, high-quality Canvas Tarps that can be used for outdoors, construction, painting, floor covering and much more. We carry treated … 2 3/2×2 3/2WebCanvas Tarps Browse through our large collection of high-quality Canvas Tarps and covers for warehousing, manufacturing, construction, trucking, painting, landscaping, and … 2 31次方 是多少