Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.<br>A:nitrogen<br>B:oxygen<br>C:carbon dioxide<br>D:water vapor

Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.
A:nitrogen
B:oxygen
C:carbon dioxide
D:water vapor

出自：海船船员证

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