The period of a lighted aid to navigation refers to the（）.<br>A:date of construction or establishment<br>B:length of time between flashes of the light<br>C:time required for the longest flash of each cycle<br>D:time required for the light to complete each cycle

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

出自：海船船员证

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