We”ve all seen screws, but how do they work? Why is it easier to screw something into something than to simply push it in? With basic hands-on experiments and clear descriptions, this simple machine is explained.
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格式 PDF ● 网页 48 ● ISBN 9780822500667 ● 出版者 Lerner Publishing Group ● 发布时间 2001 ● 下载 3 时 ● 货币 EUR ● ID 4754238 ● 复制保护 Adobe DRM
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