如图所示为等刻度轻质杠杆，A处挂4牛的物体，若使杠杆在水平位置

如图所示为等刻度轻质杠杆，A处挂4牛的物体，若使杠杆在水平位置平衡，则在B处施加力，用力的大小不可能的是

A.1牛 B. 2牛 C.4牛 D.3牛

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如图所示为等刻度轻质杠杆，A处挂4牛的物体，若使杠杆在水平位置

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