17.在做“研究杠杆平衡条件 的实验时应该使杠杆在 位置平衡.若杠杆静止在图8所示的位置可将右端的螺母� 适当调节.杠杆平衡后在a点挂3 Template




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tomski17.在做“研究杠杆平衡条件 的实验时应该使杠杆在 位置平衡.若杠杆静止在图8所示的位置可将右端的螺母� coloring