有abcd四种元素已知a元素的原子核外只有1个电子b是地壳中含量最高的元素c2 离子核外有18个电子d是血红蛋白的组成元素之一 Template




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tomski有abcd四种元素已知a元素的原子核外只有1个电子b是地壳中含量最高的元素c2 离子核外有18个电子d是血红蛋白的组成元素之一 coloring