加拿大pc28怎么玩才能赢

简介：It turns out that in the eighth year of his stay in Chongzhen, he actually built a telescope. Although it was the simplest combination of a single concave and a single convex lens with a viewing distance of only one thousand meters, it was already the prototype of a telescope. As for the source of the glass lens, he purchased it from a businessman in Franji.