相关考题
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单项选择题
Cargo in hold No.2 is on（） .
A.water
B.oil
C.fire
D.A+B -
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
