将一金属块挂在竖直的弹簧测力计挂钩上,使其处于静止状态,下列

将一金属块挂在竖直的弹簧测力计挂钩上,使其处于静止状态,下列说法正确的是
A.弹簧测力计所受重力与金属块对弹簧测力计拉力是一相互作用力
B.弹簧测力计对金属块的拉力与金属块所受重力的是一对平衡力
C.金属块所受的重力与弹簧测力计所受的重力是一对平衡力
D.弹簧测力计对金属块的拉力与金属块对弹簧测力计的拉力是一对平衡力

答案

B解析:

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