地球大气含氧量是多少 平原地区的含氧量是多少？
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1 \u4ecb\u7ecd
2 \u6ce8\u610f\u4e8b\u9879
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2\u3001\u5b9e\u9a8c\u88c5\u7f6e\u548c\u65b9\u6cd5
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3\u3001\u5b9e\u9a8c\u73b0\u8c61
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4\u3001\u5b9e\u9a8c\u7ed3\u8bba
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在一般情况下,大气中的含氧量为21%左右.山区的森林面积覆盖率高,空气中的含氧量高.
大气的气体成分较多基本为：氮(%78.084) 氧(%20.946) 氩(%0.934)水汽（%0.25）二氧化碳(%0.032) 氖(%0.0018) 氦(%0.00052) 甲烷(%0.0002) 氪(%0.0001) 氢(%0.00005) 氙(%0.000008)臭氧(%0.000001) 其他(%0.001421)
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