单选题：有两个分量，它们大小是50N和30N，则这两个力的合力的大小（　　）。

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题目内容：
有两个分量，它们大小是50N和30N，则这两个力的合力的大小（　　）。 A．可能等于50N
B．不可能等于30N
C．一定大于20N
D．一定小于20N
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