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课程 5
Simple machines: physics tricks
📖 课程
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🎯 测验——选择翻译
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✅ 本课已完成
Ancients built pyramids without cranes — with levers, ramps and pulleys. A longer lever = less force, but a longer path.
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杠杆
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滑轮
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轮子
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螺丝
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斜面
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楔子