Well Wheel Simple Machine - 搜索图片

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Examples Of Wheel And Axle Simple Machines

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YouTube > MocomiKids
Wheel and Axle - Simple Machines | Science for Kids | Educational Videos by Mocomi
YouTube · MocomiKids · 65.1万次播放 · 2012年7月10日
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Water Wheel | Water wheel, Energy projects, Science for kids

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