單項(xiàng)選擇題Diesel fuel vapors （）.

A.can not be ignited by a spark unless the vapor is in a confined space
B.are nontoxic in all concentrations
C.can not be ignited by a spark unless they are at their auto-ignition temperature
D.are heavier than air


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1.單項(xiàng)選擇題All of the following are part of the fire triangle EXCEPT （）.

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

2.單項(xiàng)選擇題The vapors given off by heated fuel oil are heavier than air and are（）.

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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Fire prevention during welding or burning aboard any vessel should include （）.

A.posting a fire watch in the immediate area
B.providing an extinguisher which is ready for immediate use
C.requiring the fire watch to remain on post for 30 minutes after the completion of welding or burning
D.All of the above