問題詳情
10. The period of incompleted darkness when the upper limb of the sun is below the visiblehorizon, and the center of the sun is not more than 6° 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：A
難度：適中0.588235
統計：A(20),B(8),C(2),D(1),E(0)