单项选择题

Cargo in hold No.2 is on（） .

A.water
B.oil
C.fire
D.A+B

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单项选择题
CO2 and Halon extinguishers are used for electrical fire, as well as （）fire.

A.common
B.oil
C.electrical
D.chemical
单项选择题
Lifeboat launching is operated at intervals of （）months.

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