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【单选题】
有两个同一直线上,下列关于合力的说法正确的是( )A.
若两个不为零,则合力不为零
B.
合力大小一定比其中任何一个
C.
若两个力大小不同,合力的方向一定跟其中较大的相同
D.
合力的大小等于两个力的大小相加
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