测量杠杆的机械效率用如图所示的装置实验竖直�上匀速拉动弹簧测力计使杠杆下面的钩码缓慢上升.1实验中将杠杆拉至图中虚线位置测力计的示 Template




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tomski测量杠杆的机械效率用如图所示的装置实验竖直�上匀速拉动弹簧测力计使杠杆下面的钩码缓慢上升.1实验中将杠杆拉至图中虚线位置测力计的示 coloring