單項(xiàng)選擇題

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

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A vessel servicing a pipeline during the day shall display（）.

A.three black shapes in a vertical line; the highest and lowest are balls，and the middle one is a diamond
B.three shapes in a vertical line; the highest and lowest are red balls，and the middle one is a white diamond
C.three black balls in a vertical line
D.two black balls in a vertical line

單項(xiàng)選擇題

A vessel sailing shall keep out of the way of all of the following vessels except a vessel （）.

A.not under command
B.engaged on pilotage duty
C.restricted in her ability to maneuver
D.engaged in fishing