To determine that a compartment contains sufficient oxygen to sustain life, you should use a/an （）.<br>A:explosimeter<br>B:oxygen indicator<br>C:fresh air indicator<br>D:all of the above

To determine that a compartment contains sufficient oxygen to sustain life, you should use a/an （）.
A:explosimeter
B:oxygen indicator
C:fresh air indicator
D:all of the above

出自：海船船员证

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