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

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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

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

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A 95-meter vessel aground sounds which fog signal? （）

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A 200-meter vessel restricted in her ability to maneuver，at anchor，will sound a fog signal of（）.

A 200-meter vessel is aground in fog. Which signal is optional? （）

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