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單項選擇題

Cargo in hold No.2 is on（） .

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

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

A.common
B.oil
C.electrical
D.chemical

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Lifeboat launching is operated at intervals of （）months.

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

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