單項選擇題A towing light is（）.

A.shown at the bow
B.white in color
C.shown in addition to the sternlight
D.an all-round light


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1.單項選擇題A towing light（）.

A.flashes at regular intervals of 50-70 flashes per minute
B.is yellow in color
C.shows an unbroken light over an arc of the horizon of not less than 180°nor more than 225°
D.All of the above

2.單項選擇題A signal of one prolonged，one short，one prolonged，and one short blast，in that order is given by a vessel（）.

A.engaged on pilotage duty
B.in distress
C.at anchor
D.being overtaken in a narrow channel

3.單項選擇題A signal of intent must be sounded in international waters by（）.

A.a vessel meeting another head-on
B.a vessel overtaking another in a narrow channel
C.a vessel crossing the course of another
D.the give-way vessel in a crossing situation

4.單項選擇題A sailing vessel shall not impede the safe passage of a（）.

A.power-driven vessel following a traffic lane
B.pilot vessel enroute to a pilot station
C.law enforcement vessel
D.All of the above

5.單項選擇題A sailing vessel is overtaking a power-driven vessel in a narrow channel，so as to pass on the power-driven vessel’s port side. The overtaken vessel will have to move to facilitate passage. The sailing vessel is the（）.

A.stand-on vessel and would sound two short blasts
B.give-way vessel and would sound no whistle signal
C.stand-on vessel and would sound no whistle signal
D.give-way vessel and would sound two prolonged blasts followed by two short blasts