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單項(xiàng)選擇題

A mobile offshore drilling unit will show the day-shape in DIAGRAM 10 to indicate that it is （）.

A.at anchor
B.being towed
C.aground
D.drilling

單項(xiàng)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