用如图所示的实验装置测量杠杆的机械效率.实验时竖直�上匀速拉动弹簧测力计使挂在较长杠杆下面的钩码缓缓上升.1实验中将杠杆拉至图中虚线 Template




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tomski用如图所示的实验装置测量杠杆的机械效率.实验时竖直�上匀速拉动弹簧测力计使挂在较长杠杆下面的钩码缓缓上升.1实验中将杠杆拉至图中虚线 coloring