如图所示,在测定杠杆机械效率的实验中,竖直�上匀速拉动弹簧测力计,使挂在杠杆ob下面的物块缓慢上升至虚线位置,测力计的示数f为 n,测力计上升 Template




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tomski如图所示,在测定杠杆机械效率的实验中,竖直�上匀速拉动弹簧测力计,使挂在杠杆ob下面的物块缓慢上升至虚线位置,测力计的示数f为 n,测力计上升 coloring