以下试题来自:船舶电气与船舶安全题库

单项选择题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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3If 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

5Fire 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