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【单选题】
静止在水平地面上的物体受到重力 G 和支持力 F N 的作用,物体对地面的压力为 F ,则以下说法中正确的是 。A.
F 和 F N 是一对平衡力
B.
G 和 F N 是一对作用力和反作用力
C.
F N 和 F 的性质相同，都是弹力
D.
G 和 F N 是一对平衡力
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