单选题Which vessel when anchored at night，would not be required to show anchor lights? （）AA vessel engaged in underwater operationsBA vessel engaged in mine clearanceCA vessel engaged on pilotage dutyDA vessel engaged in survey operations
单选题
Which vessel when anchored at night，would not be required to show anchor lights? （）
A
A vessel engaged in underwater operations
B
A vessel engaged in mine clearance
C
A vessel engaged on pilotage duty
D
A vessel engaged in survey operations
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