单项选择题

A partly submerged vessel or object being towed，which is not readily noticeable，shall show （） .

A.yellow lights at each end
B.two red lights in a vertical line
C.a black ball
D.a diamond shape

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单项选择题
A notice of readiness is not valid unless it indicates that the vessel is ready to load or discharge as the case may be，at the time（）it is given.

A.when
B.which
C.that
D.then
单项选择题
A Notice of Marine Casualty to a vessel must include（）.

A.the estimated cost of damage
B.the name of the owner or agent of the vessel
C.an evaluation of who was at fault
D.the amount of ballast on board
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