单选题The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.Apressure differences in the atmosphereBthe length of the hose attached to the facepieceCthe physical exertion of the person wearing the deviceDspaces containing poisonous vapors
单选题
The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.
A
pressure differences in the atmosphere
B
the length of the hose attached to the facepiece
C
the physical exertion of the person wearing the device
D
spaces containing poisonous vapors
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