Cargo in hold No.2 is on（） .

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

单项选择题Fire drill is carried out once a （）.

A.year
B.day
C.week
D.month

单项选择题Any emergency pump situated （）machinery space should also be started.

A.outside
B.under
C.beside
D.besides

单项选择题On hearing the fire signal, the crew should proceed immediately to （）their assigned duties.

A. carry on
B. put out
C. carry out
D. take off