CO₂ and Halon extinguishers are used for electrical fire, as well as （）fire.

单项选择题Lifeboat launching is operated at intervals of （）months.

A.one
B.two
C.three
D.four

单项选择题Fire drill is carried out once a （）.

A.year
B.day
C.week
D.month

单项选择题Any emergency pump situated （）machinery space should also be started.

A.outside
B.under
C.beside
D.besides

单项选择题On hearing the fire signal, the crew should proceed immediately to （）their assigned duties.

A. carry on
B. put out
C. carry out
D. take off

单项选择题Efficient fire-fighting drill demands the full （）of persons in all departments of the ship.

A.operate
B.operation
C.co-operate
D.co-operation

单项选择题The signals that will be used for emergency should be clearly （）.

A. set out
B. set off
C. get off
D. cut off

单项选择题The fire drill is （）. You are dismissed.

A.finish
B.finished
C.begin
D.beginning

单项选择题Lower the （）ladder.

A.embark
B.embarkation
C.disembark
D.B+C

单项选择题The boat is （）to the water surface.

A.down
B.top
C.lower
D.up

单项选择题Ready for （）the boat.

A.lower
B.lowering
C.lowered
D.topped