题型:选择题 — Nobody likes , so you'd better be kind to others. — So sorry. I won't do it again. [ ]A. laugh at B. to laugh at C. to be laughed at D. to be laughed 查看答案
题型:问答题 型号镜头焦距光圈快门CCD解析度Sony-S7034mm8s-1/1000s1024×768数码相机是一种新兴的照相器材,它同普通照相机不同之处,在于它没有底片,而是通过一个特殊的感光层CCD,将图象的光信号转化成为数字信号保存起来.下表是某数码相机的一些参数,请你根据这个表格,用所学过的知识来说明,感光层离开镜头的距离要满足什么条件______;要成像,物体离开镜头的距离要满足什么条件:______. 查看答案