功的公式中有一种理解方式是恒力的水平分力乘合位移,这里为什么能用分力去乘�? 知乎 Template




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tomski功的公式中有一种理解方式是恒力的水平分力乘合位移,这里为什么能用分力去乘�? 知乎 coloring