Simulated Test [PREVIOUS] [NEXT] Part I Structure and Vocabulary Section A Directions: Beneath each of the following sentences, there are 4 choices marked A, B, C and D) Choose the one that best completes the sentence. Mark your answer on the ANSWER SHEET by blackening the corresponding letter in the brackets. (5 points)

Section I Listening Comprehension Directions: This section is designed to test your ability to understand spoken English. You will hear a selection of recorded materials and you must answer the questions that accompany them. There are three parts in this ection, Part A, Part B and Part C. Remember, while you are doing the test, you should first put down your answers in your test booklet. At the

一、例题精解 【例题6.1】图6.1(a)所示电路中,已知R=R1=R2=R3=22,C=1F,L=1H, E=12V。电路原来处于稳定状态,t=0时闭合开关S.试求初始值i(0+)ic(0+)、u(0+)、 uc(0) R

一、填空(本题28分) 1.PN结的伏安特性方程i= ,表明PN结 导电性。 2.放大电路中,已知三极管三个电极的对地电位为UA=-9V,UB=-6.2V, Uc=-6V,则该三极管是 型三极管,A为 极, B为 极,C为 极

I Consider the graph shown in Fig. 15-15. Denote the tree made up of b 6, bs, and b, by t (a)Find all the fundamental loops of this graph corresponding to T (b) Find all the fundamental cutsets of this graph corresponding to t (c) Write the incidence matrix of this graph choose n 4 as the datum

第二节总线 5.2.1总线定义、特点和实体 1.定义:一组能为多个部件分时共享的信息传送线路。 2.特点:分时、共享。 通常作法:发送部件通过0C组件或三态门分时发送信息,由打入脉冲将信息送入指定接收部件

一、羧酸衍生物的结构 羧酸衍生物在结构上的共同特点是都含有酰基(-c),酰基与其 所连的基团都能形成P-π共轭体系。 (1)与酰基相连的原子的电负性都比碳大,故有-I效应

2 Basis Principles of FT NMR C Gerd Gemmecker 1999 Nuclei in magnetic fields Atomic nuclei are composed of nucleons, i.e., protons and neutrons. Each of these particles shows a property named\spin\(behaving like an angular momentum) that adds up to the total spin of the

一、例题精解 【例题3.1】在R、L、C元件串联的电路中,已知R=30,L=127mh,c=40uF, 电源电压u=2202sin(314t+20°)V.(1)求感抗、容抗和阻抗;(2)求电流的有效值1 与瞬时值i的表达式;(3)求功率因数cos;(4)求各部分电压的有效值与瞬时值的表 达式;(5)作相量图;(6)求功率P、Q和S

1. To answer correctly is more important than () A. answered quickly B. a quick answer C. quickly answered D. to answer quickly 2.It ( until dark that he realized that it was too late to return home. A. is B. wasn't C. weren''td.were3. Do you remember() Tom about this before? A. to telling B. telling C. to have told D. tell 4. Look, () A. there he goes B. there goes he C. he goes there D. he there goes.It seems difficult () A. to stop the child to crying B. to stop the child of crying C. stopping the child cry D. to stop the child from crying 6.I have never drunk ( beer in my life. A. the better one B. more best C. more better D. better