通信 作文 英语【一】
Dear Dad，
Today is fathers day， for so many years Ive been seekig a way to express my heartfelt thanks for all you have done for me. Here comes it!
Thank you for always being there sharing my life when I need you most. Whenever I encounter difficulties， I never feel alone and vulnerable， because you will keep me on the right path. Im blessed to have you.
Thank you for offering me education and teaching me how to be a man. You always inspire me not by words， but by what you have done! Your efforts in the work， your loyalty to your friends， your responsibility for the family and your persistence in the life have already set me good examples in my own life.
Thank you for always appreciating my work， no matter how tiny it is! You have made me realize that its capacity not scores that really counts.
Dad， I love you and I will love you forever!
Yours beloved，
Li Ming
通信 作文 英语【二】
暑假即将来临。
你班同学讨论了假期计划，提出了不同看法。
请根据提示写一篇有关讨论的英语短文，并谈谈你的看法。
注意：1.短文必须写在答题卡的指定区域，词数80——120（不含已写好部分）。
2．短文必须包括表中所列要点，可根据内容分段表达。
3．可适当增加细节，以使行文连贯。
4．参考词汇：眼界——horizon（或view）
One possible version：
The summer holiday is coming. Our class have had a discussion about what to do during the holiday. Some are in favor of staying at home. They think it’s both convenient and comfortable. What’s more, they can save money for other purposes. But they will lose the chance of getting to know the outside world.
However, others prefer to go out for traveling since it can increase their knowledge and broaden their horizons. But they will spend more money and meet some difficulties while traveling.
In my opinion, it would be much better to stay at home, for I can do what I like, such as reading books, watching TV, and helping my parents with the housework.
通信 作文 英语【三】
2.1 ARP协议工作流程
根据TCPIP协议的定义，任何的需要远程通信和访问的主机在进行任何形式的通信前必须获得用于传输的本地地址。如果通信发起的源主机和通信目的端主机在同一个子网网段，那么这种通信形式不需要进行网关的数据交换，本地地址就是目的主机的硬件地址。否则通信发起者就要通过本地路由器(网关的地址向目的主机进行IP地址和物理地址的沟通。 本文只考虑不需要使用路由器的情况。
在不使用路由器的前提下，ARP 进行地址解析的步骤如下：通信发起端在网络中广播接收端的 IP 地址，然后与广播地址一致的计算机在收到广播后会相应地发送一个应答，该应答中包含了该应答计算机的IP 地址和实际物理地址的相关信息，接着发送端用接收到的地址信息进行数据分组和传输，最后发送端将获取到 MAC 地址信息存入本地缓存，作为下次通信数据传输的地址配置信息，这个本地缓存就是ARP 缓存。
如果数据传输的地址相同，那么发送端就可以通过读取 ARP 缓存来获取 MAC 地址，如果数据传输的地址与以往不同，则重复上文的步骤直到获取物理地址。
2.2 51单片机网络通信时ARP 协议中缓存机制分析与实现
ARP 缓存条目可以使用静态或者动态两种方式生成。使用静态的方式生成 ARP 缓存条目时占用系统的资源较多，运行效率不高，所以通常采用动态方式生成 ARP 缓存。ARP 条目的定时刷新主要通过定时器来实现，缓存的生存期由单片机定时器初始值和刷新定时器的时间间隔的乘积确定，ARP 条目的查询操作定义可考虑直接对缓存中的IP 地址进行逐个比较来完成查询操作，具体的定义为：发送方先在 ARP 缓存中查询目的方主机的地址，如果在缓存中能够查找到，说明此前进行过该路由的通信过程，则可以在获得目的主机的MAC 地址后开始进行数据传输;否则就需要进行上文提到的获取ARP缓存的步骤，发送ARP请求报文直至对方的进行应答。
2.3 ARP报文格式
一个完整的 ARP 头部包含 28个字节的数据，在硬件类型部分选用 DIX 型以太网帧(值为 1;协议类型部分选用 IP 协议(注册值为0x0800;硬件地址长度部分为 6字节;PLEN 为 IP 地址长度部分值为4字节;操作代码部分，当请求操作时值为 1，应答操作时值为 2。
通信 作文 英语【四】
什么叫通信卫星呢?
通信卫星又称同步卫星。它的特点是运转方向和绕地球一周的时间都与地球自转方向和时间相同。从地面上看去，它像和地球赛跑的运动员，速度与地球的自转“旗鼓相当”。其实，它在远离地球的轨道上运行，速度比起地球的自转速度来可快多了。
通信卫星的“年龄”并不大。但是，从20世纪60年代至今已更新换代3次了，现在正以越来越快的速度向前飞速发展。目前，许多国家都在进行通信卫星的研究，我国已于今年成功地发射了试验性通信卫星。这标志着我国科学技术的又一大进步。
1984年的暑假里，在美国洛杉矶举行了举世瞩目的第二十三届奥运会。在比赛的那几天，我们每天都能在电视中看到当天比赛的情况。是谁把比赛的实况从远在大洋彼岸的洛杉矶传到这儿来的呢?这就是通信卫星的功劳。通信卫星的作用大得很。它不仅能使人们及时看到世界各地发生的重大事件，还能让各国人民通过电话互相增进了解。过去，电话通讯是靠电话线，而电视信号的传播则必须通过徽波中继站进行。这在不大的范围内还行得通，如果要翻山过海，就不得不花费巨大的人力、物力。通信卫星的诞生，像是给人们长上了“千里眼”、“顺风耳”，使这种状况有了很大的.改观。
一颗先进的通信卫星，可以通两路彩色电视，上百万路的电话；它的工程范围也很大。只要有了通信卫星，按一定距离运行在赤道上空的轨道上，就可以形成一个统一的全球通讯网，真可谓神通广大。
卫星为什么能够进人太空呢?那是因为有运载火箭给与了它们一定的高度和速度。通信卫星对运行轨道有严格的要求。火箭只有将卫星送人离地面约35 800公里的同步轨道内，通信卫星才能“老老实实”地呆在地球某一地区的上空。由此可见，通信卫星的发射也是一门很复杂的科学技术。
通信卫星的前景是十分广阔的。不久的将来，通信事业将更加发达。那时，通信卫星的技术也自然会逐步提高。它将可以通五六路彩色电视，上千万路电话。不仅如此，通信卫星还将应用到其他各个领域，如搜寻失踪飞机、船只等等。总之，通信卫星——这个卫星家族中的一员，将显示出越来越大的神通，为各国人民作出更大的贡献。
通信 作文 英语【五】
Dear Daddy,
亲爱的爸爸，
Thank you very much for your letter written to me. In your letter , you not only expressed your expectation to me , but also showed all your love to me . I was deeply moved . Thanks again ,Daddy .You said ," I hope you get bravery and perseverance, and can quickly grasp living skills like a lion ". Now I want to tell you that I will try my best to do everything well and live up to your expectations . Dear father , you are a great lion in my mind .
谢谢你给我写信。在信中，你不仅仅表达了你对我的期望，还展示了你对我所有的爱。我深深感动了。再次谢谢你，爸爸。你说，“我希望你能够变得勇敢和有耐心，并且能像狮子般快速的掌握生活技能。”现在我想说我会尽我最大的.努力把所有事情都做好来达到你的期望。亲爱的爸爸，你是我心中的狮子。
When I am absent mind , when I am depressed, you , my dear father is always there . Your advice and encouragement guide me through many difficulties . Thank you , Dad, for your help and understanding. I love you , Dad ,forever!
当我茫然、绝望时，是你，我亲爱的爸爸永远都在我身边。你的建议和勇气引导我克服许多的困难。谢谢你，爸爸，谢谢你的帮助和理解。我永远爱你，爸爸。
通信 作文 英语【六】
This is my first week in ** Senior Middle School.Everything here is new for me.Our school is an old school but it`s very beautiful.I have 50 new classmates in my class.They`re all very excellent, I think, and I felt a little sad.Because I`m too common.But come to think of it,it`s a very good thing.I believe I can also be very excellent if I study with such excellent classmates.I didn`t know why Ms *** chose me to be the committee of study.But I know it`s a good chance for me to raise my ability.All I can do is do my best in the future.I am sure that Ms *** and my classmates can help me when I do something wrong. Because they`re all very kind.It`s a pleasure to work and study with them.I`m really very happy.I`m not an outstanding student in this class,but I can do the same thing like others.I believe I won`t make anyone disappointed.
通信 作文 英语【七】
Father's Day
Yesterday was Father's Day. I had planned to give my father a present. But I didn't remember it until in the morning.It was too late to post a card to him. So I decided to buy something. When I was in the department store. I found it was not easy for me to choose something right for him. Suddenly I
got an idea. I ran home and opened my computer. I made a beautiful card and mailed him through the Internet. then I began to make supper. When father came home, he was very glad to find a big meal on the table. then I asked him to check his e-mail. He was amazed to find a beautiful card in his e-mail-box.
What a wonderful surprise!
