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【正文】 龔赤兵 . [M].北京：人民郵電 出版社 ,2021。 第 22 頁 共 23 頁 致 謝 本文是在劉永紅老師和韓斌老師的熱情關心和指導下完成的，他們淵博的知識和嚴謹的治學作風使我受益匪淺，對順利 完成本課題起到了極大的作用。在此向他們表示我最衷心的感謝！ 感謝我的同學在系統(tǒng)開發(fā)過程中給予的幫助，正是因為他的幫助，使我遇到的一些意想不到的難題和疑惑被一個個的攻破，使我的課題得以順利地完全地達到了預期的目標，并使論文最終得以順利地完成。 在論文完成過程中，本人還得到了家人以及其他老師和許多同學的熱心幫助，本人向他們表示深深的謝意！ 最后向在百忙之中評審本文的各位專家、老師表示衷心的感謝！ 作者簡介 姓 名：楊雯 性別 ： 女 出生年月： 1983 年 12 月 民族： 漢 Email: 第 23 頁 共 23 頁 聲 明 本論文的工作是 2021年 2月至 2021年 6月在成都信息工程學院網絡工程系完成的。文中除了特別加以標注地方外，不包含他人已經發(fā)表或撰寫過的研究成果，也不包含為獲得成都信息工程學院或其他教學機構的學位或證書而使用過的材料。除非另有說明，本文的工作是原始性工作。 關于學位論文使用權和研究成果知識產權的說明： 本人完全了解成都信息工程學院有關保管使用 學位論文的規(guī)定，其中包括： （ 1）學校有權保管并向有關部門遞交學位論文的原件與復印件。 （ 2）學?？梢圆捎糜坝　⒖s印或其他復制方式保存學位論文。 （ 3）學校可以學術交流為目的復制、贈送和交換學位論文。 （ 4）學校可允許學位論文被查閱或借閱。 （ 5）學?？梢怨紝W位論文的全部或部分內容（保密學位論文在解密后遵守此規(guī)定）。 除非另有科研合同和其他法律文書的制約，本論文的科研成果屬于成都信息工程學院。 特此聲明！ 作者簽名： 年 月 日 第 24 頁 共 23 頁 Billy saw service with the infantry in Europe, and was taken prisoner by the Germans. After his honorable discharge from the Army in 1945, Billy again enrolled in the Ilium School of Optometry. During his senior year there, he became engaged to the daughter of the founder and owner of the schoo l, and then suffered a mild nervous collapse. He was treated in a veterans39。 hospital near Lake Placid, and was given shock treatments and released. He married his fianc 閑 , finished his education, and was set up in business in Ilium by his fatherinlaw. Ilium is a particularly good city for optometrists because the General Fe and Foundry Company is there. Every employee is required to own a pair of safety glasses, and to wear them in areas where manufacturing is going on. GFamp。F has sixtyeight thousand employees in Ilium. That calls for a lot of lenses and a lot of frames. Frames are where the money istion of coalmines was far distant and there was no dread of scarcity. There were still extensive mines to be worked in the two Americas. The manufactories, appropriated to so many different uses, lootives, steamers, gas works, amp。c., were not likely to fail for want of the mineral fuel。 but the consumption had so increased during the last few years, that certain beds had been exhausted even to their smallest veins. Now deserted, these mines perforated the ground with their useless shafts and forsaken galleries. This was exactly the case with the pits of Aberfoyle. Ten years before, the last butty had raised the last ton of coal from this colliery. The underground working stock, traction engines, trucks which run on rails along the galleries, subterranean tramways, frames to support the shaft, pipes in short, all that constituted the machinery of a mine had been brought up from its depths. The exhausted mine was like the body of a huge fantasticallyshaped mastodon, from which all the ans of life have been taken, and only the skeleton remains. Nothing was left but long wooden ladders, down the Yarrow shaft the s, carpenters, outside and inside laborers, women, children, and old men, all were collected in the great yard of the Dochart pit, formerly heaped with coal from the mine. Many of these families had existed for generations in the mine of old Aberfoyle。 they were now driven to seek the means of subsistence elsewhere, and they waited sadly to bid farewell to the engineer. James Starr stood upright, at the door of the vast shed in which he had for so many years superintended the powerful machines of the shaft. Simon Ford, the foreman of the Dochart pit, then fiftyfive years of age, and other managers and overseers, surrounded him. James Starr took off his hat. The miners, cap in hand, kept a profound silence. This farewell scene was of a touching character, not wanting in grandeur. My friends, said the engineer, the time has e for us to 第 25 頁 共 23 頁 separate. The Aberfoyle mines, which for so many years have united us in a mon work, are now exhausted. All our researches have not led to the discovery of a new vein, and the last block of coal has just been extracted from the Dochart pit. And in confirmation of his words, James Starr pointed to a lump of coal which had been kept at the bottom of a basket. This piece of coal, my friends, resumed James Starr, is like the last drop of blood which has flowed through the veins of the mine! We shall keep it, as the first fragment of coal is kept, which was extracted a hundred and fifty years ago from the bearings of Aberfoyle. Between these two pieces, how many generations of workmen have succeeded each other in our pits! Now, it is over! The last words which your engineer will address to you are a farewell. You have lived in this mine, which your hands have emptied. The work has been hard, but not without profit for you. Our great family mustrent pits came forward to shake hands with him, whilst the miners waved their caps, shouting, Farewell, James Starr, our master and our friend! This farewell would leave a lasting remembrance in all these honest hearts. Slowly and sadly the population quitted the yard. The black soil of the roads leading to the Dochart pit resounded for the last time to the tread of miners39。 feet, and silence succeeded to the bustling life which had till then filled the Aberfoyle mines. One man alone remained by James Starr. This was the overman, Simon Ford. Near him stood a boy, about fifteen years of age, who for some years already had been employed down below. James Starr and Simon Ford knew and esteemed each other well. Goodby, Simon, said the engineer. Goodby, Mr. Starr,