题目内容
望远镜视觉放大倍率与物目镜焦长之比成反比
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虽然望远镜具有较大的视觉放大倍率，但其横向放大倍率是视觉放大倍率的倒数，成缩小像
开普勒望远镜物镜框为孔阑、目镜框为渐晕光阑，分划板为视场光阑
手持望远镜，由于考虑到望远镜视场抖动影响，通常设计到10倍以下较为合理
Read the following paragraph carefully and cross out the sentence which breaks unity.①The rapid increase in crime in Chicago is causing a great deal of concern to the city’s citizens. ②People are afraid to go out into the streets at night because they are afraid of being robbed or even killed. ③More and more families are moving out of the city into the suburbs because of the high crime rate. ④The chief of police was fired last month because of his inability to reduce crime. ⑤People are buying strong locks for their doors and installing heavy iron bars across their windows to prevent burglaries. ⑥Some citizens are even purchasing guns to protect themselves and their property. ⑦Indeed, it seems that the increase in crime is turning the average home in Chicago into a prison for its inhabitants.
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