A mobile offshore drilling unit must display obstruction lights when it is on the waters over the Outer Continental Shelf and is（）.<br>A:under tow<br>B:fixed to the seabed<br>C:underway<br>D:All of the above

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

出自：海船船员证

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