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单选题
You are about to enter a compartment to investigate a suspected smoldering fireIf youre not wearing a self-contained breathing apparatus, you should test the compartments atmosphere to determine if there is/are （）.
A
sufficient oxygen to sustain human life
B
an explosive mixture in the compartment
C
a toxic atmosphere in the compartment
D
All of the above
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unburned carbon particlesB
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