Close the port side （）(通风口) .

单项选择题The emergency alarm is sounded on （）(汽笛) according to master’s order.

A.VHF
B.whistle
C.broadcast
D.sextant

单项选择题There is a smell of gas in the hold. You must wear your （）(氧气面罩).

A. fire mask
B. breathing apparatus
C. life-jacket
D. fire drill

单项选择题Prepare for （）(弃货) cargo.

A.jettisoning
B.lowering
C.hoisting
D.abandoning

单项选择题Post two lookouts with （）(望远镜).

A.binoculars
B.mask
C.sextant
D.VHF

单项选择题Prevent （）(油) overboard

A.chips
B.water
C.cotton
D.oil