下列的水属于纯净物的是 ( )A.矿泉水 B.自来水 C.硬水 D.浮有冰的水2008年北京奥运会若用大型遥控飞艇作广告.为了安全,艇内充入的气体最好是 ( )A.氢气 B.氧气 C.氦气 D.二氧化碳.为什么说含氧

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