A 200-meter vessel restricted in her ability to maneuver，at anchor，will sound a fog signal of（）.<br>A:a 5 second ringing of a bell forward and a 5 second sounding of a gong aft at intervals of 1 minute<br>B:one prolonged followed by two short blasts every 2 minutes<br>C:one prolonged followed by three short blasts every minute<br>D:one prolonged followed by three short blasts every 2 minutes

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

出自：海船船员证

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