在研究杠杆平衡条件的实验中如图.1把杠杆挂在支架上实验前没有挂钩码时�现杠杆右端下倾可将右端螺母�左边旋转使杠杆在水平位置平衡其 Template




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tomski在研究杠杆平衡条件的实验中如图.1把杠杆挂在支架上实验前没有挂钩码时�现杠杆右端下倾可将右端螺母�左边旋转使杠杆在水平位置平衡其 coloring