下列化学符号与所表述意义相符合的是 A.ca 1个钙元素b.2h 1个氢分子由2个氢原子构成c.o2 2个氧原子d.mg2 1个镁离子 Template




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tomski下列化学符号与所表述意义相符合的是 a.ca 1个钙元素b.2h coloring