关于2道物理文科基础题目58.对于万有引力定律的表达式 ,下列说法中正确的是( ) (A)公式中G为引力常量,它是由实验测得的,而不是人为规定的(B)当r趋于零时,万有引力趋于无限大(C)若m1、m2大小

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