船舶通訊與航海英文(概要)題庫下載題庫

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18.A phase of the characteristic of a flashing light during which the light is not exhitited defines __________ .
(A)directional area
(B) eclipse
(C)faint sector
(D)unintensified sector



18.A phase of the characteristic of a fl..-阿摩線上測驗