有abcd四种短�期元素已知一个b原子核的原子受到α粒子的轰击得到一个a原子的原子核和一个c原子的原子核又知cd元素同主族且能 Template




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tomski有abcd四种短�期元素已知一个b原子核的原子受到α粒子的轰击得到一个a原子的原子核和一个c原子的原子核又知cd元素同主族且能 coloring