单项选择题
A.yellow lights at each end
B.two red lights in a vertical line
C.a black ball
D.a diamond shape
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.
单项选择题 A Notice of Marine Casualty to a vessel must include（）.
单项选择题 （）is a notice served by a shipmaster to the Charterers informing them that the vessel is ready to load according to the terms outlined in the charter.