不定项选择对于同种元素的两种同位素原子核内的a.核子数相同 B.质子数相同中子数不同 C.质子数不同中子数不同 D.原子的质量数相同 Template




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tomski不定项选择对于同种元素的两种同位素原子核内的a.核子数相同 b.质子数相同中子数不同 c.质子数不同中子数不同 coloring