Thank you ladies and gentlemen for a very warm reception. It was one hundred and forty-four years ago that members of the Democratic Party first met in convention to select a Presidential candidate. Since that time, Democrats have continued to convene once every four years and draf t a party

Ladies and gentlemen of the convention: My name is Geraldine Ferraro. I stand before you to proclaim tonight: America is the land where dreams can come true for all of us. As I stand before the American people and think of the honor this great convention has bestowed upon me, I recall

I have requested this opportunity to talk to the people of Massachusetts about the tragedy which happened last Friday evening. This morning I entered a plea of guilty to the charge of leaving the scene of an accident. Prior to my appearance in court it would have been improper for me to comment on these matters. But tonight I am free to tell you what happened and to say what it means to me

Ann Richards: 1988 Democratic National Convention Keynote Address Thank you. Thank you. Thank you, very much. Good evening, ladies and gentlemen. Buenas noches, mis amigos. I'm delighted to be here with you this evening, because after listening to George Bush all these years, I figured you needed to know what a real Texas accent sounds like

Jimmy Carter: \Energy and the National Goals - A Crisis of Confidence\ Good Evening: This a special night for me. Exactly three years ago, on July 15, 1976, I accepted the nomination of my party to run for President of the United States. I promised you a President who is not isolated f rom the people, who feels your pain, and who shares

Martin Luther King, Jr.: \I Have a Dream\ I am happy to join with you today in what will go down in history as the greatest demonstration for f reedom in the history of our nation. Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared in the flames

乙烷裂解制取乙烯的反应如下：C2H6 C2H4 + H2, 已知 1073 K 时的速率常数 k=3.43 s−1 , 问当乙 烷的转化率为 50%和 75%时分别需要多长时间？

背景 年 1625 1830 1930 1960 1974 1987 1999 人口(亿) 5 10 20 30 40 50 60 世界上人口在较快地增长人口总量还在迅速膨胀,而且每个 人消耗的资源也在不断增加,地球的环境质量急剧恶化.世 界人口发展的几个数据:

（一）立项依据与研究内容（4000-8000 字）： 1. 项目的立项依据（研究意义、国内外研究现状及分析，附主要参考文献目录。） 血吸虫病是热带亚热带发展中国家的严重寄生虫病。据世界卫生组织（WHO）报道， 该病在全世界 74 个国家中流行，6 亿多人口受到威胁，2 亿多人受到感染，其中 1.2 亿 伴有临床症状，2000 万伴有严重后遗症；全世界每年死于血吸虫病性肝纤维化及其并发 症的患者达 50 万-100 万；血吸虫病在 14 岁以下的儿童中发病率之高，严重影响了儿童 的智力发育和身心健康[1]

方法一:先标度变换,再时延 因为a=2,所以x(21)0)E50 因为b=对时移(向右)所以(21-5)4hsa|me