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【单选题】
对质点组有以下几种说法: (1)质点组总动量的改变与内力无关 (2)质点组总动能的改变与内力无关 (3)质点组机械能的改变与保守内力无关 在上述说法中: ( )
A.
只有（1）正确
B.
（1）（3）正确
C.
（1）（2）正确
D.
（2）（3）正确
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