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(1)所谓同位素,是A.电子数相同的不同元素的原子B.中子数相同的不同元素的原子C.中子数不同的同种元素的原子
(1) The so-called isotopes are A. atoms of different elements of the same number of electrons B. atoms of different elements of the same number of neutrons C. atoms of the same element of different numbers of neutrons