Deck : Deck General - 3337/5076
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| When a mobile offshore drilling unit on the waters of the U.S. Outer Continental Shelf has more than one obstruction light, the lights must be operated to flash __________. |
| A) at the same time |
| B) in sequence at intervals of ten seconds |
| C) in sequence at intervals of five seconds |
| D) in sequence at intervals of fifteen seconds |
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