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

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Which vessel would display a cone，apex downward（）.

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Which statement is TRUE in an overtaking situation（）.

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