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)