单项选择题
You are approaching a vertical lift bridge.You know the span is fully open when（）.
A.Three white lights in a vertical line are lit B.A red light starts to flash at about 60 times a minute C.A yellow light is illuminated on the bridge pier D.There is a range of green lights under the lift span
单项选择题 Which vessel would display a cone，apex downward（）.
单项选择题 Which statement is TRUE in an overtaking situation（）.
单项选择题 Which nautical charts are intended for coastwise navigation outside of outlying reefs and shoals（）.
