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【单选题】
You had better ___ a doctor as soon as possible.
A. seeing
B. saw
C. see
D. seen
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答案
C
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He opened the letter and it contained ___.
A. an important information
B. some important informations
C. many important information
D. some important information
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He has been writing for 3 years, but being a writer is not his ___.
A. chance
B. choice
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They have never heard any ___.
A. a customer complaint
B. the customer's complaints
C. customer's complaint
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He is not a child ___.
A. no more
B. no longer
C. any much
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The retired man is used to ___ his two dogs early in the morning.
A. exercise
B. exercising
C. exercised
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It was not ___ midnight that they discovered the children were not in their bedroom.
A. before
B. at
C. after
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Young ___ he is, he knows how to get along with others.
A. like
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Could you show me where the___ shoes are?
A. Women
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He succeeded ___ out a lot of things entirely new in the world.
A. in working
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It took me a long time to ___ the disappointment of failing the exam.
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D. get down
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She ___ 100 pages of the book today.
A. has already read
B. already reads
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He has been ___ for nearly three weeks after the death of his dear pet.
A. sad
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One cannot learn a foreign language well ___he studies hard.
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A large number of people___ present at the meeting, which was out of our expectation.
A. was
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When the girls saw the funny man, they couldn't ___ laughing.
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B. keep on
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We are glad that we finally managed to get into contact ___ them.
A. at
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Uncle Sam sent him a___ bicycle as a birthday present.
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The plane was about to___, and yet I left my ticket behind.
A. take off
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C. take up
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John succeeded ___ what he wanted.
A. to get
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【单选题】
The accident was ___ to careless driving.
A. for
B. likely
C. due
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With a good command of reading skills, most students can manage to read ___as they could the year before.
A. as twice fast
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Some famous singers live on the ___from their record sales.
A. salary
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_____of them thinks that is a good idea.
A. Anyone
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Don't be too ___about things you're not supposed to know.
A. strange
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It was in 1969 ___the American astronauts succeeded in landing on the moon.
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___people in the world are sending information by e-mail every day.
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A. takes
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The taxi driver always reminds passengers to ___their belongings when they leave the car.
A. keep
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【单选题】
Little Tom is used to getting up ___eight every morning.
A. at
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【单选题】
If the doctor had been available, the child _______.
A. would not die
B. could not have died
C. might not die
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If Mary___shopping this afternoon, please ask her to write a shopping list first.
A. will go
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These desks and chairs ___to the children in the mountain villages next week.
A. are sent
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Every society has its own peculiar customs and ___of acting.
A. attitudes
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A. on
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The dog was tearing the cloth___its teeth.
A. with
B. by
C. through
D. in
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A. by
B. in
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【单选题】
54振荡器的输出信号最初由___而来的。
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【单选题】
55产生正弦波自激震荡的稳定条件是___。
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56从结构上来看,正弦振荡电路是一个 ___ 。
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B. 没有输入信号的带选频网络的正反馈放大器;
C. 没有输入信号的不带选频网络的正反馈放大器。
【单选题】
57对频率稳定度要求较高的振荡器,要采用: ___ 。
A. LC振荡电路;
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【单选题】
58在甲类、乙类、甲乙类放大电路中,其导通角分别为___
A. 小于180 O、180 O、360O
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【单选题】
W78XX系和列W79XX系列引脚对应关系为 ___ 。
A. 一致;
B. 1脚与3脚对调,2脚不变;
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【单选题】
60两个β相同的晶体管组成复合管后,其电流放大系数约为 ___ 。
A. β
B. β2
C. 2β
D. 1+β
【单选题】
1三极管的开关特性是___。
A. 截止相当于开关接通
B. 放大相当于开关接通
C. 饱和相当于开关接通
D. 截止相当于开关断开,饱和相当于开关接通
【单选题】
2数字集成门电路,目前生产最多应用最普遍的门电路是___
A. 与门
B. 或门
C. 非门
D. 与非门
【单选题】
3由一个三极管组成的基本门电路是___。
A. 与门
B. 非门
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【单选题】
4在遥测系统中,需通过___把非电量的变化转变为电信号。
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B. 电容器、
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D. 晶体管
【单选题】
5半导体发光数码管由___个条状的发光二极管组成。
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B. 6
C. 7
D. 8
【单选题】
6“有0出1,全1出0”属于___
A. 与逻辑
B. 或逻辑
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D. 与非逻辑
【单选题】
7二进制数11101转化成十进制数为___
A. 29
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C. 4
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【单选题】
8TTL系列集成芯片工作电源电压的典型值是___。
A. 18V
B. 5V
C. 3V
D. 10V
【单选题】
9能实现Y=0的电路是___图。
A. 图
B. 图
C. 图
D. 图
【单选题】
10以下表达式中符合逻辑运算法则的是___。
A. 1+1=10
B. A+A=2A
C. A+=1.
D. A·=1
【单选题】
11对于TTL与非门闲置输入端的处理,不可以___
A. 与有用输入端并联
B. 通过电阻3kΩ接电源
C. 接地
D. 接电源
【单选题】
12十线/四线优先编码器74LS147所用的输出代码为___。
A. 5421BCD码
B. 格雷码
C. 8421BCD码
D. 余3码
【单选题】
13为实现“线与”逻辑功能,应选用___
A. OC门
B. 与门
C. 异或门
D. 同或门
【单选题】
14和逻辑式A+ABC相等的式子是___
A. c
B. bc
C. abc
D. a
【单选题】
15逻辑函数的表示方法中具有唯一性的是___
A. 真值表
B. 表达式
C. 逻辑图
D. 卡诺图
【单选题】
16与模拟电路相比,数字电路主要的优点是___。
A. 容易设计
B. 通用性强
C. 抗干扰能力强
【单选题】
17某门电路的输入输出波形如图所示,试问此逻辑门的功能是___。
A. 与非
B. 或非
C. 异或
D. 同或
【单选题】
18以下电路中常用于总线应用的有___。
A. TSL门
B. OC门
C. 漏极开路门
D. CMOS与非门
【单选题】
逻辑表达式Y=AB可以用___实现。
A. 正或门
B. 正非门
C. 正与门
D. 负或门
【单选题】
20TTL电路在正逻辑系统中,以下各种输入中___相当于输入逻辑“0”。
A. 悬空
B. 通过电阻2.7kΩ接电源
C. 通过电阻2.7kΩ接地
D. 通过电阻510Ω接地
【单选题】
21对于TTL与非门闲置输入端的处理,不可以___。
A. 接电源
B. 通过电阻3kΩ接电源
C. 接地
D. 与有用输入端并联
【单选题】
22STTL数字集成电路与CMO数字集成电路相比突出的优点是___。
A. 微功耗
B. 高速度
C. 高抗干扰能力
D. 电源范围宽
【单选题】
23以下式子中正确的是___
A. 1+A=A
B. A+A=1
C. A•A=1
D. A+AB=A
【单选题】
在一个四变量逻辑函数中,___为最小项。
A.
B.
C.
D.
【单选题】
A+BC=___。
A. A+B
B. A+C
C. (A+B)(A+C)
D. B+C
【单选题】
26以下代码中为无权码的为___。
A. 5421BCD码
B. 8421BCD码
C. 余三码
【单选题】
一位十六进制数可以用___位二进制数来表示。
A. 4
B. 2
C. 1
D. 16
【单选题】
28十进制数25用8421BCD码表示为___。4位
A. 10 101
B. 0010 0101
C. 100101
D. 10101
【单选题】
29与十进制数(53.5)10不等值的数或代码为___。
A. (0101 0011.0101)8421BCD
B. (35.8)16
C. (110101.1)2
D. (60.4)8
【单选题】
30与八进制数(47.3)8等值的数为___
A. (100111.011)2
B. (97.3)16
C. (27.3 )16
D. (100111.11)2
【单选题】
31下列各型号中属于优先编码器是___。
A. 74LS85
B. 74LS138
C. 74LS148
D. 74LS48
【单选题】
七段数码显示器BS202是___。
A. 共阳极LED管
B. 共阴极LED管
C. 共阳极LCD管
D. 共阴极LCD管
【单选题】
33八输入端的编码器按二进制数编码时,其输出端的个数是___。
A. 2个
B. 3个
C. 4个
D. 8个
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