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发表于2024-11-05
Pulleys pdf epub mobi txt 电子书 下载 2024
This series offers a clear introduction to simple machines--what they are, what they're made of, and how we use them in today's world. Exciting examples of each machine's applications draw on the world familiar to a child, including some that may be "hidden" in household objects or everyday fixtures.
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Pulleys pdf epub mobi txt 电子书 下载 2024