单项选择题

One advantage of the all-purpose nozzle is that it（）.

A.can fit any size hose
B.converts a stream of water into a fog
C.increases the amount of water reaching the fire
D.can spray two streams of water at the same time

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单项选择题

Once a vessel has loaded packaged hazardous cargo，the cargo spaces shall be inspected. The spaces shall also be inspected at least once in every 24 hours. The only exception to daily inspection is when（）.

A.a vessel is equipped with an automatic smoke or fire detecting system
B.the cargo hatches are of steel construction
C.the cargo is of a nonflammable type
D.there is sufficient fire protection located on the main deck adjacent to the cargo hatch

单项选择题

On a ship，when may a work vest be substituted for a required life preserver?（）

A.To replace a damaged life preserver
B.For use during fire drills
C.For use during boat drills
D.At no time

单项选择题

On a ship，watertight doors should be operated（）.

A.during abandon drill
B.during fire drill
C.weekly
D.when the rig is being moved