单项选择题

在集合地点集合。（）

A. Meet in front of the muster station.
B. Get hold of the ladder.
C. Drop me a heaving line to lift my bag.
D. A ship is made fast to the equipment by mooring lines.

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救生艇下水每隔三个月进行一次。（）

A. Lifeboat launching is operated at intervals of three months.
B. Lifeboat launching is operated at intervals for three months.
C. Fire drill is carried out once a month.
D. Don’t operate two or more hatch covers at the same time.

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Which letter means that oil-spilling has happened?（）

A.P
B.O
C.S
D.G

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（）is best for electrical fire.

A. Dry extinguisher
B. Power extinguisher
C.A+B
D. CO₂ extinguisher