单项选择题
A proper look-out shall be maintained（）.
A.only at night
B.only during restricted visibility
C.at night and during restricted visibility
D.at all times
点击查看答案&解析
相关考题
-
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 -
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
