单选题The self-contained breathing device should not be used in which situation（）.AOxygen deficient spacesBCompartments containing poisonous vaporsCFighting fires that produce heavy smokeDUnderwater search
单选题
The self-contained breathing device should not be used in which situation（）.
A
Oxygen deficient spaces
B
Compartments containing poisonous vapors
C
Fighting fires that produce heavy smoke
D
Underwater search
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