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.only in fog
B.only between the hours of sunset and sunrise
C.only when entering and leaving port
D.at all times
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
A.humidity
B.varying densities of water
C.vessel traffic
D.the jet stream
A.besides
B.excepted
C.otherwise
D.other than
A.there are other vessels in the vicinity
B.operating in a traffic separation scheme
C.engaged in a situation involving more than two vessels
D.necessary to avoid immediate danger
最新試題
Which statement about the Navigation Rules is TRUE?（）.
A vessel（）when underway shall so far as possible，keep out of the way of a vessel not under command.
One of the factors which affects the circulation of ocean currents is（）.
A vessel approaching a narrow channel shall（）.
A vessel enagaged in fishing，and at anchor，shall show（）.
A vessel constrained by her draught may，in addition to the lights prescribed for power-driven vessels in Rule 23，exhibit where they can best be seen（）or a cylinder.
A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights（）.
A vessel engaged in trawling will show identification lights of（）.
In a crossing situation，a stand-on vessel which is forced to take action in order to avoid collision with a vessel on her own port side shall，if possible，avoid（）.
If the circumstances of the case admit，any vessel（）in a narrow channel.