单项选择题

A monkey fist is found on a （）.

A.heaving line
B.lead line
C.manrope
D.mooring line

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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

单项选择题

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

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