Deficient oxygen content inside a chain locker can be detected with（）.<br>A:litmus paper<br>B:combustible gas indicator<br>C:oxygen breathing apparatus<br>D:oxygen indicator

Deficient oxygen content inside a chain locker can be detected with（）.
A:litmus paper
B:combustible gas indicator
C:oxygen breathing apparatus
D:oxygen indicator

出自：海船船员证

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