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发表于2024-11-08
Seesaws NutcrackersBrooms Gateway Simple Machines pdf epub mobi txt 电子书 下载 2024
Explains the concepts of simple and complex machines and mechanical advantage, and describes levers, including crowbars, can openers, and wheelbarrows, and how they work.
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Seesaws NutcrackersBrooms Gateway Simple Machines pdf epub mobi txt 电子书 下载 2024