單項選擇題

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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單項選擇題

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

單項選擇題

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