在如图所示的“研究杠杆平衡条件 的实验中 1实验前要调节杠杆两端的 使杠杆在 位置平衡 2若实验前杠杆�左端倾下则应将杠杆左端的 Template




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tomski在如图所示的“研究杠杆平衡条件 的实验中 1实验前要调节杠杆两端的 coloring