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跪求商场企业案例!!!!!

飘林00700 2014-09-13 01:15:39 311  浏览
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  • 回旋木马594 2014-09-14 00:00:00
    初二物理题 1.在下列实验中,能看到物体实象的是 A.用放大镜观察蚂蚁 B.坐在电影院里看电影 C.对着平面镜看自己的象 D.欣赏玻璃钢水中的金鱼 这道题应该是C吧.就是有点犯迷糊.C的象是发生漫反射到人们眼中的,但它成象到光屏上,应该是实象吧? 2.小张的照相机有三个不同焦距的镜头(28MM,50MM,200MM)若他想在近处拍摄一高楼的全貌,应选用 A.28MM的镜头 B.50MM的镜头 C.200MM的镜头 D.三个都可以 选A还是D? 简述理由,谢谢! 3.某班同学在拍摄毕业照时,照相机镜头上停着一只苍蝇,则拍出来的照片 A.会有一只正立,放大的苍蝇 B.不会出现苍蝇,但会有一个大黑点 C.不会出现苍蝇,但比正常情况下暗些 D.会有一只倒立,放大的苍蝇 选B还是C呢? 我感觉是B吧? 对吗? 4.人的眼睛中什么相当于快门. 好象书里没学. 5.视网膜到晶状体的距离是不变的,眼睛是靠改变___的焦距看清远,近不同的物体的. 6.如果将碎成两半的透镜拼合在一起成实象,如果将上下两半透镜左右移开一小段距离,这时呈现在光屏上的象是怎样的?

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