8-1串行扩展概述 一、串行扩展特点 (1)最大程度发挥最小系统的资源功能。 原来由并行扩展占用的P0口、P2口资源,直 接用于I/0口。 (2)简化连接线路,缩小印板面积 (3)扩展性好,可简化系统的设计。 (4)串行扩展的缺点:

Part I Listening Comprehension (20 minutes) Directions: In this section, you will hear ten short conversations At the end of each conversation, a question will be asked about what was said. both the conversation and the question will be spoken only once. After each question there will be a pause During the pause, you must read the four choices marked A), B), C)and D),and

Part I Listening Comprehension(20 minutes Directions: In this section, you will hear ten short conversations At the end of each conversation, a question will be asked about what was said. both the conversation and the question will be spoken only once. After each question there will be a pause During the pause, you must read the four choices marked A), B), C)and D),and

Part I Listening Comprehension (20 minutes) Directions: In this section, you will hear ten short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A),B),C)and D),and decide which is the best answer. Then mark the corresponding letter on the Answer Sheet with a single line through the center

I. Structure(15 minutes) Section a单词和语法选择 Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A, B), C, D). Then you should mark the corresponding letter on the Answer Sheet with a single line through the center

SOLUTIONS TO TEXT PROBLEMS 24.(b) A benzyl group(C., CH2) is ortho to the phenolic hydroxyl group in o-benzylphenol. OH CH2C.Hs (c)Naphthalene is numbered as shown. 3-Nitro-I-naphth has a hydroxyl group at C-1 and a nitro group

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

Simulated Test [PREVIOUS] [NEXT] Part I Structure and Vocabulary Section A Directions: Beneath each of the following sentences, there are choices marked A, B, C and)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)

Simulated Test [PREVIOUS] INEXT] 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 anawer on the ANSWER SHEET by blackening the corresponding letter in the brackets. (5 point)

Simulated Test [PREVIOUS] INEXT] Part I Structure and Vocabulary Section A Directions: Beneath each of the following sentences, there are four 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)