阿摩線上測驗
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
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統計： A(130), B(416), C(72), D(53), E(0) #1799109
統計： A(130), B(416), C(72), D(53), E(0) #1799109
