单项选择题

A proper look-out must be kept（）.

A.only in fog
B.only between the hours of sunset and sunrise
C.only when entering and leaving port
D.at all times

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单项选择题

A head-on situation at night is one in which you see（）.

A.one sidelight of a vessel ahead of you
B.one sidelight and a masthead light of a vessel ahead of you
C.one sidelight，a masthead light，and a range light of a vessel ahead of you
D.both sidelights of a vessel dead ahead of you

单项选择题

One of the factors which affects the circulation of ocean currents is（）.

A.humidity
B.varying densities of water
C.vessel traffic
D.the jet stream

单项选择题

Vessels，（）support vessels，should not enter the safety zone of a deepwater port unless clearance has been obtained from the Vessel Traffic Supervisor.

A.besides
B.excepted
C.otherwise
D.other than