单项选择题
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
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
