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)

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