單項(xiàng)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

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單項(xiàng)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

單項(xiàng)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

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A towing light（）.

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

A signal of intent must be sounded in international waters by（）.

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