单选题A flashing light is a light that（）.Aflashes at regular intervals at a frequency of 120 flashes or more per minuteBis yellow in colorCis visible over an arc of the horizon of not less than 180°nor more than 225°DAll of the above
单选题
A flashing light is a light that（）.
A
flashes at regular intervals at a frequency of 120 flashes or more per minute
B
is yellow in color
C
is visible over an arc of the horizon of not less than 180°nor more than 225°
D
All of the above
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