The bypass valve on a self-contained breathing device should be opened if（）.<br>A:you are entering a space containing poisonous vapors<br>B:you are entering a space containing explosive gases<br>C:the regulator of the breathing apparatus malfunctions<br>D:the face piece of the breathing device is too tight

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

出自：海船船员证

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