单选题The bypass valve on a self-contained breathing device should be opened if（）.Ayou are entering a space containing poisonous vaporsByou are entering a space containing explosive gasesCthe regulator of the breathing apparatus malfunctionsDthe face piece of the breathing device is too tight
单选题
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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