单选题A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started? （）AWhen the towing vessel enters the fogBWhen the drilling rig enters the fogCWhen the towing vessel can no longer be seen from the rigDImmediately
单选题
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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