3.1.1测得某放大电路中BJT的三个电极A、B、c的对地电位分别为a=-9v,VB= 6V,Vc=-6.2V,试分析A、B、C中哪个是基极b、发射极e、集电极c,并说明此BJT是NPN 管还是PNP管

(1) 指出下列每种分子中心原子价轨道的杂化类型： （a） CS2 （b）SO3（c）CBr4 （d）SeF6 （e）NO2

1071．The proportion of gastroesophageal reflux symptoms in the general populaton is： A．1％～8％ （易、记忆） B．7％～15％ C．14％～22％ D．21％～29％ E．28％～36％

UNIT 1: PROBLEMS 1. A reaction has the stoichiometric equation A+B=2R. What is the order of reaction? 2. A reaction with stoichiometric equation +B=R+IS has the following rate expression r.= What is the rate expression for this reaction if the stoichiometric equation is written as A+2B=2R+S?

一、填空题:(每空1分,共15分) 1传统教育派的代表人物赫尔巴特的代表作是《》:现代教育派的代表人

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Part I: Describe the following 10 terms (3 points each). (1) EF-G: a. its structure likes tRNA b. it is a translational elongation factor c. it binds to ribosome when associated with GTP

In this unit, you will first listen, and then talk about famous universities; read about Oxford University and Stanford University; .understand both Passage and Passage B; avisit Culture Salon for the mission statement of Birmingham University and a tradition of Princeton University;

1. A reaction has the stoichiometric equation A+B=2R. What is the order of reaction? 2. A reaction with stoichiometric equation +B=R+IS has the following rate expression r.= What is the rate expression for this reaction if the stoichiometric equation is written as A+2B=2R+S?

一、单项选择题 1、下列税种中，既属于中央地方共享税又属于流转税的是（ ）。 A、增值税 B、消费税 C、关税 D、企业所得税