问题 问答题 简答题

数字微波通信的优缺点是什么?

答案

参考答案:

数字微波通信的优点:抗干扰能力强、线路噪声不积累;便于加密,保密性强;便于组成数字通信网。数字滤波通信的缺点:占用频带宽;传输特性的变化超过一定范围时,通信质量显著恶化。

单项选择题
写作题

       你校英语外籍教师Emesto and Stasi暑假期间准备在本地开一家西餐小店,要招若干名高中生为无酬打工人员。下面是招聘启事:

                                                                   Wanted!

                                                     4 middle school students

                                            Do service work and act as translators

                                                         Healthy and helpful

                                                   Contact:wfpub@gmail.com

      假定你叫李华,愿意应聘。请写封电子邮件,介绍自己,并说明你愿意应聘的理由。词数110左右。开头已写好,不计入总词数。

       Dear Emesto and Stasi,

I happened to have read your advertisement and decide to apply for the job.____________                      ___________________________________________________________________

________________________________________________________________________              

                                                                                                                                                               

       Yours sincerely

                                                                                                                                               Li Hua