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The bypass valve on a self-contained breathing device should be opened if ______．
A.You are entering a space containing poisonous vapors
B.You are entering a space containing explosive gases
C.The regulator of the breathing apparatus malfunctions
D.The face piece of the breathing device is too tight
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更多 “ The bypass valve on a self-contained breathing device should be opened if ______．A.You are entering a space containing poisonous vaporsB.You are entering a space containing explosive gasesC.The regulator of the breathing apparatus malfunctionsD.The face piece of the breathing device is too tight ” 相关考题
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单选题The bypass valve on a self-contained breathing device should be opened if（）.A
you are entering a space containing poisonous vaporsB
you are entering a space containing explosive gasesC
the regulator of the breathing apparatus malfunctionsD
the face piece of the breathing device is too tight
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the same self-contained breathing apparatus required with the fireman's outfitC
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a portable ventilation system that will provide a complete change of air every three minutes
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