問題詳情

7. The time of incompleted darkness when the center of the sun is 12° below the celestial horizon.It is:
(A) Civil twilight
(B) Nautical twilight  
(C) Astronomical twilight
(D) Global Horizon twilight

參考答案

答案:B
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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