問題詳情

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

參考答案

答案:B
難度:適中0.666667
統計:A(0),B(2),C(0),D(1),E(0)

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