单选题If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of （）.Aunburned carbon particlesBexcess nitrogenCa lack of oxygenDexcess hydrogen
单选题
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
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