单选题You are approaching a vertical lift bridge.You know the span is fully open when（）.AThree white lights in a vertical line are litBA red light starts to flash at about 60 times a minuteCA yellow light is illuminated on the bridge pierDThere is a range of green lights under the lift span
单选题
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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