你可能感興趣的試題

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

單項(xiàng)選擇題

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