單項選擇題

A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started? （）

A.When the towing vessel enters the fog
B.When the drilling rig enters the fog
C.When the towing vessel can no longer be seen from the rig
D.Immediately

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單項選擇題

A mobile offshore drilling unit must display obstruction lights when it is on the waters over the Outer Continental Shelf and is（）.

A.under tow
B.fixed to the seabed
C.underway
D.All of the above

單項選擇題

A message by flashing light consists of the call，the identity，the text，and the （）.

A.destination
B.answer
C.time
D.ending

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A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started? （）

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A mobile offshore drilling unit must display obstruction lights when it is on the waters over the Outer Continental Shelf and is（）.

A message by flashing light consists of the call，the identity，the text，and the （）.

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A message by flashing light consists of the call，the identity，the text，and the （）.