单项选择题
A power driven vessel when towing and the length of the tow exceeds 200 meters shall exhibit during daylight hours where they can best be seen which of the following shapes? （）
A.a diamond shape
B.two cones，apexes together
C.a black ball
D.one cone，apex upward
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相关考题
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单项选择题
A fog signal consisting of one prolonged blast followed by four short blasts would indicate thepresence of a（）.
A.vessel being towed
B.fishing vessel engaged in trawling
C.vessel at anchor warning of her location
D.power-driven pilot vessel on station underway -
单项选择题
A flashing light is a light that（）.
A.flashes at regular intervals at a frequency of 120 flashes or more per minute
B.is yellow in color
C.is visible over an arc of the horizon of not less than 180°nor more than 225°
D.All of the above -
单项选择题
A drawbridge may use visual signals to acknowledge a vessel’s request to open the draw. Which signal indicates that the draw will NOT be opened immediately?（）.
A.A flashing amber light
B.A fixed red light
C.A white flag raised and lowered vertically
D.A flashing white light
