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Kacy Zhang
2015
發(fā)布于 2024-04-02 · 圖片1 
People build simple machine because with the simple machine ,doing work is easier. in this book, I learned many simple machines, such as wedge, lever ,ramp ,wheel, axle, screw, and pulley. ?
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Let's-Read-and-Find-Out Science 2: Simple Machines
作者:D.J. Ward, Mike Lowery (Illustrations)
出版社:HarperCollins
出版時間:2015-10
Kacy Zhang
Kacy Zhang
2015