Deck : General Navigation - 138/2138
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| Under the U.S. Aids to Navigation System, a special mark possesses which of the following characteristics? |
| A) Must be lighted with a fixed or flashing white light |
| B) May show a yellow light with a flashing rhythm |
| C) May show a light with the Morse code "A" rhythm |
| D) Must be lighted with a yellow isophase light |
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