單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題A 95-meter vessel aground sounds which fog signal? （）

A.A rapid ringing of a bell for 5 seconds every two minutes
B.A whistle signal of one short，one prolonged，and one short blast
C.A prolonged blast of the whistle at intervals not to exceed one minute
D.A rapid ringing of a bell for 5 seconds，preceded and followed by three separate and distinct strokes on the bell

4.單項選擇題A 200-meter vessel restricted in her ability to maneuver，at anchor，will sound a fog signal of（）.

A.a 5 second ringing of a bell forward and a 5 second sounding of a gong aft at intervals of 1 minute
B.one prolonged followed by two short blasts every 2 minutes
C.one prolonged followed by three short blasts every minute
D.one prolonged followed by three short blasts every 2 minutes

5.單項選擇題A 200-meter vessel is aground in fog. Which signal is optional? （）

A.A bell signal
B.A gong signal
C.A whistle signal
D.All of the above