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 （）.<br>A:sufficient oxygen to sustain human life<br>B:an explosive mixture in the compartment<br>C:a toxic atmosphere in the compartment<br>D:All of the above

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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