Section A : Listen to some statements about the time ball. Fill in the Blanks with what you hear on the tape 1.The time ball was originally used as a marine ____________. 2.The Greenwich time ball is said to be the world’s first public __________. 3.The ball is automatically raised halfway up the mast at ________ to the Top at 12:58 p.m., and drop at________

2、甲基丙烯酸甲酯（M1）浓度=5mol/L，5-乙基-2-乙烯基吡啶浓度=1mol/L，竞聚率： r1=0.40，r2=0.69；a、计算聚合共聚物起始组成（以摩尔分数计），b、求共聚物组成与单体 组成相同时两单体摩尔配比

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

friends and enemies: I just can't believe everyone in here is a friend, and I don't want to leave anybody out. The question tonight, as I understand it, is \The Negro Revolt, and Where Do We Go From Here?\ or What Next?\ In my little humble way of understanding it, it points toward either the ballot or the bullet. Before we try and explain what is meant by the ballot or the bullet, I would like to clarify something concerning myself. I'm still a Muslim;

My Fellow Americans, I come before you tonight as a candidate for the Vice Presidency and as a man whose honesty and integrity has been questioned. Now, the usual political thing to do when charges are made against you is to either ignore them or to deny them without giving details. I believe we've had enough of that in the United States, particularly with the present Administration in Washington

Good evening my fellow Americans. Ten days ago, in my report to the nation on Vietnam, I announced a decision to withdraw an additional 150,000 Americans f rom Vietnam over the nex t year. I said then that I was making that decision despite our concern over increased enemy activity in Laos, in Cambodia, and in South Vietnam

Tonight I want to talk to you on a subject of deep concern to all Americans and to many people in all parts of the world, the war in Vietnam. I believe that one of the reasons for the deep division about Vietnam is that many Americans have lost confidence in what their Government has told them about our policy. The American people cannot and should not be asked to support a policy which involves the overriding

The Academy of management Review, Vol 6, No 4(Oct. 1981), 609-620 Stable url: http://links.jstor.org/sici?sici=0363-7425%28198110%296%03a4%3c609%03atcoiot%3e2.0.c0%3b2-m The Academy of Management Review is currently published by Academy of Management. Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at

平推流反应器 Piston Flow Reactor (PFR) 活塞流模型或理想置换模型 This type of units is illustrated in the following figure. This reactor consists of a tube inside which the reaction medium flows. This makes i t t h e s i m p l e s t s t r u c t u r e conceivable f or a continuou s o p e r a ti o n s ys t em . Th e h ea t exchange necessary to add heat to the system or to remove it generally occurs ac ros s the tube wall

6.1 抽样定理——sampling theorem 6.2 脉冲模拟调制 6.3 脉冲编码调制(PCM, pulse-code modulation) 6.4 差分脉冲编码调制 6.5 增量调制 (Delta modulation, ΔM, DM) 6.6 时分复用 (TDM,time division multiplexing)