230问答网 > 约占空气体积分数21%的气体是

约占空气体积分数21%的气体是

约占空气体积分数21%的气体是
2025-03-26 13:29:47
推荐回答（6个）
回答1：

答案：氧气

其中
氮气约占78%,氧气约占21%,稀有气体约占0.94%，二氧化碳占0.03%,其它气体和杂质占0.03%

回答2：

是氧气，没错

回答3：

氧气！

回答4：

oxygen

回答5：

氧气

回答6：

【答案】B
【答案解析】试题分析：空气中体积分数约占21％的气体是氧气，氮气大约占78%，故选B.
考点：空气的成分

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