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轉一道題目

Floor 1 浅风仁樱 5/6/13 19:29
兩個質量數和質子數都分別相等的微粒,它們( )
A、一定是同位素 B、一定是同種元素
C、有相同的中子數 D、核內質子數與中子數相等

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