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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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

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

A towing light is（）.

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A towing light（）.

A signal of one prolonged，one short，one prolonged，and one short blast，in that order is given by a vessel（）.

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