The self-contained breathing device should not be used in which situation（）.<br>A:Oxygen deficient spaces<br>B:Compartments containing poisonous vapors<br>C:Fighting fires that produce heavy smoke<br>D:Underwater search

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

出自：海船船员证

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