Hand Crank Pulley System Small Pulley Make Large Pulley Spin Faster - 搜索图片

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YouTube > The Evening Woodworker
Locking Bucket Pulley System | Indoor Treehouse Part 5
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youtube.com > Redneck & redbeard
Easy & cheap Hand crank pulley system for hanging deer
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YouTube > MocomiKids
What is a Pulley? (With Narration) Simple Machines | Science for Kids | Educational Videos by Mocomi
YouTube · MocomiKids · 13.8万次播放 · 2013年8月22日

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Wheel And Axle Illustrations, Royalty-Free Vector Graphics …

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