适应人作业的氧含量的合格范围是（）

发布于 2022-09-10 16:07:20

A.18-20%
B.19、5-23%
C.23%以上
D.19、5-23、5%

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猫哥 2022-09-10

这家伙很懒，什么也没写！

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