在测量�轮组的机械效率的实验中所用器材有弹簧秤�轮四只每只重25牛顿d适当长的细绳 1根据现有的实验器材在图所示的四个 Template




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tomski在测量�轮组的机械效率的实验中所用器材有弹簧秤�轮四只每只重25牛顿d适当长的细绳 1根据现有的实验器材在图所示的四个 coloring