单项选择题

Throw a （）to the person overboard and help him come on board.

A.lifeboat
B.life-raft
C.lifebuoy
D.fire mask

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单项选择题

（）extinguish oil and electrical fires with water.

A.Do
B.Did
C.Never
D.Isn’t

单项选择题

（） fire doors, windows, hatches, accesses and ventilators.

A.Closed
B.Close
C.Closing

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