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氧气含量多少正常
更新时间: 2020-11-16 00:00:00  

空气中氧含量在21%左右,正常的氧含量是21%,低于21%则视为缺氧,但城市人口90%处于不同程度的缺氧状态.除空气污染这个众所周知的原因外,心脑血管疾病,呼吸系统疾病,高强度用脑也是造成缺氧的重要原因,而夏季特定的气候,使缺氧更为突出。

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