在采区回风巷、采掘工作面回风巷风流中瓦斯浓度超过( )或二氧化碳浓度超过1.5%时,必须停止工作,撤出人员,采取措施,进行处理
A.0.5%
B.0.75%
C.1.0%
D.1.5%
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正确答案: C 答案分析:无
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