A proper look-out must be kept（）.

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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1.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

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2.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

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3.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

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4.单项选择题The Rules state that vessels may depart from the Rules when（）.

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

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5.单项选择题Which statement about the Navigation Rules is TRUE?（）.

A.The rules require vessels to comply with Traffic Separation Scheme regulations
B.The rules use the term safe speed
C.The Rules permit a stand-on vessel to take action prior to being in extremis
D.All of the above are correct

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6.单项选择题If a seaplane is not used as a means of transpiration on water but is capable of being used so，it shall（）.

A.be regarded as a vessel not under command
B.be regarded as a vessel underway
C.be regarded as a vessel
D.be regarded as a sailing vessel

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7.单项选择题If a vessel is engaged in fishing according to the definitions in the Rules，it will have （）.

A.gear extending from the side or stern
B.gear that restricts maneuverability
C.less than 50 percent trolling lines
D.None of the above

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8.单项选择题If a vessel of special construction cannot fully comply with the Rules，her degree of compliance shall be determined by（）.

A.IMO
B.The owners of the vessel
C.The government
D.The builder

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9.单项选择题If the circumstances admit，（）of small alteration of course and speed shall not be taken to avoid collision.

A.depression
B.oppression
C.succession
D.possession

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10.单项选择题If the circumstances of the case admit，any vessel（）in a narrow channel.

A.shall have the liberty to anchor
B.shall avoid anchoring
C.shall moor to a buoy when necessary
D.shall keep anchoring

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