发表于2024-11-20
Levers 2024 pdf epub mobi 电子书
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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.
Levers 2024 pdf epub mobi 电子书