如图所示abcd分别是两个可以绕ac两转轴转动的质量均匀的杠杆它们的质量相等长度相等.现在b端施加一个始终垂直ab杆的力使ab杆和 Template




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tomski如图所示abcd分别是两个可以绕ac两转轴转动的质量均匀的杠杆它们的质量相等长度相等.现在b端施加一个始终垂直ab杆的力使ab杆和 coloring