一、由电路求响应 由S域等效电路 1.元件→域运算阻抗R,L,M,C→R,L,M、 sC信号→象函数i(t),u(t)→I(s),U(s)

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

Lyndon Baines Johnson: \We Shall Overcome\ Mr. Speaker, Mr. President, Members of the Congress: I speak tonight for the dignity of man and the destiny of democracy. I urge every member of both parties, Americans of all religions and of all colors, f rom every section of this country, to join me in that cause. At times history and fate meet at a single time in a single place to shape a turning

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

Franklin D. Roosevelt: The Four Freedoms Mr. Speaker, members of the 77th Congress: I address you, the members of this new Congress, at a moment unprecedented in the history of the union. I use the word “unprecedented” because at no previous time has American security been as seriously threatened f rom without as it is today

I. Target decision设定谈判目标 Il. Collecting information收集情报 I. Staffing negotiation teams组建谈判小组 IV. Choice of negotiation venues选择谈判地点

underground['^ n d agr a u n d]a.地下的 via['vaia]prep.经过,通过 keyboard[ki:b:d]n.键盘 visual[' vi zj ual]a.视觉的,光学的 originate[a' r i si ne i tJv.发生,开始 originating call发端呼叫

asynchronous[a'si6 k ranas]a.异步的 serial[' sirian]a.串行的,串联的 transmission[ t raen z'mi∫an]a.传输,发送 interface[ i n taf e i s]r.接口

1、试确定图 1-1 中 2、如右图所示电路，电流 I=（ ） 3、如右图所示电路，电流 I=（ ）

按物理量是否随时间改变，可分为恒定量，变动量。 ①大小和方向都不随时间而改变，用大写字母表示U, I . ② 随时间变化的量,每个时刻值称为瞬时值u(t), i(t)