下列说法错误的是 A.氧气可用作火箭燃料           B.氮气

下列说法错误的是

A.氧气可用作火箭燃料           B.氮气可用于制造氮肥

C.氦气可填充探空气球           D.二氧化碳常用于灭火

答案

A

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