Which vessel when anchored at night，would not be required to show anchor lights? （）<br>A:A vessel engaged in underwater operations<br>B:A vessel engaged in mine clearance<br>C:A vessel engaged on pilotage duty<br>D:A vessel engaged in survey operations

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

出自：海船船员证

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