A.engaged in underwater construction
B.under sail and power
C.a pilot vessel
D.trawling
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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
A.not under command
B.engaged on pilotage duty
C.restricted in her ability to maneuver
D.engaged in fishing
A.forward masthead light
B.after masthead light
C.stern light
D.All of the above
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
A.two all-round red lights in a vertical line
B.anchor lights and sidelights
C.two all-round white lights in a vertical line，sidelights and a stern light
D.two all-round red lights in a vertical line，sidelights，and a stern light
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A vessel entering the eye of a hurricane should expect（）.
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A vessel servicing a pipeline during the day shall display（）.
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A vessel or object being towed astern shall display a(n)（）.
A vessel is to make a voyage between New York and San Juan，Puerto Rico，and return. The crew should be signed on（）.