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The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.
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The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.
A、Set
B、Frequency
C、Period
D、Functio
时间：2022-01-05 16:35
关键词：
地文航海
答案解析
C
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