A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.<br>A:engaged in underwater construction<br>B:under sail and power<br>C:a pilot vessel<br>D:trawling

A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.
A:engaged in underwater construction
B:under sail and power
C:a pilot vessel
D:trawling

出自：海船船员证

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