If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of （）.<br>A:unburned carbon particles<br>B:excess nitrogen<br>C:a lack of oxygen<br>D:excess hydrogen

If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of （）.
A:unburned carbon particles
B:excess nitrogen
C:a lack of oxygen
D:excess hydrogen

出自：海船船员证

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