利用如图所示的实验装置测杠杆的机械效率.1实验时要竖直�上匀速拉动弹簧测力计2实验中将杠杆拉至图中虚线位置时测力计的示数如图所 Template


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tomski利用如图所示的实验装置测杠杆的机械效率.1实验时要竖直�上匀速拉动弹簧测力计2实验中将杠杆拉至图中虚线位置时测力计的示数如图所 coloring