如图甲所示的杠杆是平衡的若如图乙所示在支点两侧的物体下方分别加挂一个等重的物体杠杆a仍能平衡 B不能平衡a端上升 C不能平衡 Template




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tomski如图甲所示的杠杆是平衡的若如图乙所示在支点两侧的物体下方分别加挂一个等重的物体杠杆a仍能平衡 b不能平衡a端上升 c不能平衡 coloring