单项选择题
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
相关考题
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单项选择题
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 -
单项选择题
A vessel or object being towed astern shall display a(n)（）.
A.forward masthead light
B.after masthead light
C.stern light
D.All of the above -
单项选择题
A vessel not under command shall display（）.
A.two red lights at night and two black balls during daylight
B.two red lights at night and three black balls during daylight
C.three red lights at night and two black balls during daylight
D.three red lights at night and three black balls during daylight
