全麻时吸入气中最低氧浓度为( )A.21% B.28% C.33% D.

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问题 全麻时吸入气中最低氧浓度为(  )A.21%B.28%C.33%D.40%E.45%

选项 A.21%
B.28%
C.33%
D.40%
E.45%

答案 C

解析
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