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发表于2024-11-28
Machines pdf epub mobi txt 电子书 下载 2024
What is a first-class lever and the advantage in using one? How does a windmill work? Are human beings machines? Children will learn the answers to these questions and more by conducting safe experiments using materials found in the home. A fun-filled and educational way to explore science including ideas for further experimentation and hints on turning experiments into science fair projects. Illustrated.
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Machines pdf epub mobi txt 电子书 下载 2024