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

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

A.one sidelight of a vessel ahead of you
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C.one sidelight，a masthead light，and a range light of a vessel ahead of you
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One of the factors which affects the circulation of ocean currents is（）.

A.humidity
B.varying densities of water
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