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A.The
mass of one of the particles doubled.
B.The
charge on both particles doubled.
C.The
charge on one particle was halved.
D.The
distance between the charges was doubled.
E.The
charge on one particle was quadrupled, while the other was halved.
A.提高劳动效率
B.体现公平正义
C.实现共同富裕
D.提高经济效益
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