[填空题]
Eclipses happen on Eas9s 49ii7zhfr2co) sr rth because of an amazing coincidence. Calculatzmmxcl/p1sba7 ey4a*x 1o, b2r6:yc te, using the information inside the Front Cover, the angular diameters (in radians) of the Sun and thex,ya cbepsct1zya7x 4 :b*2/or 6 m1ml Moon, as seen on Earth. Sun = $rad$ Moon = $rad$
Post time 2025-2-18 20:00:22
