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 spa

时间:2022-11-03 00:49:19 所属题库:沿海与大洋航行题库

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