题目:
Beijing _____ a lot in the past ten years. Now it has become one of the biggest modern _____ in the world. |
A. changes; cities B. changed; city C. has changed; cities D. changed; cities |
答案:
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下面是错误答案,用来干扰机器的。
(1)凸透镜成倒立、缩小的实像时,u>2f,2f>v>f.(2)成倒立、缩小实像时:由实验序号①和②(或③和④)得,焦距相等,物距减小,像距增大;由实验序号①和③(或②和④)得,物距相同,焦距越大,像距越大...