单项选择题

All of the following are part of the fire triangle EXCEPT （）.

A.fuel
B.oxygen
C.heat
D.electricity

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单项选择题

The vapors given off by heated fuel oil are heavier than air and are（）.

A.odorless
B.explosive
C.nontoxic
D.visible

单项选择题

If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?（）

A.Pump only if the discharge is led to a shore tank or barge
B.Pump only during the hours of darkness
C.Pump only on the outgoing tide
D.Pump only as much as is necessary

单项选择题

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