1.使空气中O2分别和足量白磷、铁完全反应.多次实验的结果是:白磷消耗空气中约21%(体积)的O2,铁消耗空气中约19.5%(体积)的O2,实验结果表明( )A.磷的用量少 B.铁的用量少 C.等量白磷和
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