An oxygen indicator will detect （）.<br>A:concentrations of explosive gas<br>B:an oxygen deficiency in a space<br>C:the presence of harmful amounts of carbon monoxide<br>D:All of the above

An oxygen indicator will detect （）.
A:concentrations of explosive gas
B:an oxygen deficiency in a space
C:the presence of harmful amounts of carbon monoxide
D:All of the above

出自：海船船员证

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