问题 单项选择题

在S=(D1-D2)/H=K/H公式中,关于H的叙述,错误的是()

 

A.称为模糊值

B.亦称不锐利度

C.以毫米为单位

D.或称密度移行距离

E.其值越小,边缘越模糊

答案

参考答案:E

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书面表达。

     根据中文提示和英文书信内容,写一封意思连贯、符合逻辑、不少于60词的回信(信的开头和结尾

已给出,其字数不计入所完成的回信内)

     假设你叫玛丽,是校刊英语角的主持人,你收到了一位同学迈克的来信。请你根据他的来信内容

写一封回信,针对他的烦恼,谈谈你的看法,同时提出一些建议。

     Dear Mary,

     It seems that some of my classmates are so lucky that they can get everything they want. Some of them

have mobile phones and MP4s, and others wear expensive clothes and shoes. But I have nothing good. My

parents are both workers and they are not rich.I know I can't ask for those kinds of things from them.

Luckily, my parents agreed to give me some money for breakfast every day. I plan to save the money to buy

something I want. What do you think of my idea?

                                                                                                                                          Yours

                                                                                                                                           Mike

Hi, Mike,

     Nice to hear from you. __________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

                                                                                                                                               Yours, 

                                                                                                                                                Mary

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