单选题The period of a lighted aid to navigation refers to the（）.Adate of construction or establishmentBlength of time between flashes of the lightCtime required for the longest flash of each cycleDtime required for the light to complete each cycle
单选题
The period of a lighted aid to navigation refers to the（）.
A
date of construction or establishment
B
length of time between flashes of the light
C
time required for the longest flash of each cycle
D
time required for the light to complete each cycle
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