What is about 20% of the air?快要答案不要翻译,谢谢 about one fifth of the air is oxygen about four fifths of the air is nitrogen. 两句话帮忙也翻译一下吧,谢谢

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What is about 20% of the air?快要答案不要翻译,谢谢 about one fifth of the air is oxygen about four fifths of the air is nitrogen. 两句话帮忙也翻译一下吧,谢谢
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What is about 20% of the air?快要答案不要翻译,谢谢 about one fifth of the air is oxygen about four fifths of the air is nitrogen. 两句话帮忙也翻译一下吧,谢谢
What is about 20% of the air?

要答案不要翻译,谢谢
about one fifth of the air is oxygen
about four fifths of the air is nitrogen. 两句话帮忙也翻译一下吧,谢谢

What is about 20% of the air?快要答案不要翻译,谢谢 about one fifth of the air is oxygen about four fifths of the air is nitrogen. 两句话帮忙也翻译一下吧,谢谢
oxygen

什么是约20%的空气?

空气的20%是什么?

20%的空气是设么?

oxygen