时序电路的输出状态仅与此刻输入变量有关。
A、正确
B、错误
答案是:错误
基本逻辑运算有与、或、非三种。
A、正确
B、错误
答案是:正确
组合逻辑电路的输出状态仅取决于输入信号状态。
A、正确
B、错误
答案是:正确
组合电路工作特点是:任意时刻的输出状态,仅取决于当前输入,而且与前一时刻的电路状态无关。
A、正确
B、错误
答案是:正确
数字电路中用“1”和“0”分别表示两种状态,二者无大小之分。
A、正确
B、错误
答案是:正确
一位十六进制数可以用多少位二进制数来表示?
A、1
B、2
C、4
D、16
答案是:C
在决定 一事件结果的所有条件中要求所有的条件同时满足时结果就发生,这种条件和结果的逻辑关系是
A、与
B、或
C、非
D、异或
答案是:A
数字电路中使用的数制是
A、二进制
B、八进制
C、十进制 @2十六进制
答案是:A
符合“或”关系的表达式是
A、1+1=2
B、1+1=10
C、1+1=1
D、1+1=0
答案是:C
在时钟脉冲作用下,( )只具有置位、复位、保持三种功能。
A、D触发器
B、JK触发器
C、RS触发器
D、T触发器
答案是:C
电路分析中一个电流得负值,说明它小于零。
A、正确
B、错误
答案是:错误
两个电路等效,即它们无论其内部还是外部都相同。
A、正确
B、错误
答案是:错误
叠加定理是用来分析计算线性电路中的电压、电流和功率的。
A、正确
B、错误
答案是:错误
在任一瞬时,一个结点上电流的代数和恒等于零。
A、正确
B、错误
答案是:正确
电路中电流的实际方向是电位降低的方向,可据此来判别电流源或电压源上电流或电压的关联性。
A、正确
B、错误
答案是:正确
两个电阻串联,R1:R2=1:2,总电压为60V,则U1的大小为
A、10V
B、20V
C、30V
D、40V
答案是:B
人体的安全电压为多少V
A、10V
B、100V
C、36V
D、50V
答案是:C
某一段导体两端的电压为5V,通过导体的电流为0.5A,则导体的电阻为
A、2.5Ω
B、5Ω
C、10Ω
D、0Ω
答案是:C
当电路中电流的参考方向与电流的真实方向相反时,该电流
A、一定为正值
B、一定为负值
C、不能肯定是正值或负值
D、为0
答案是:B
电路提供了( )流通的路径
A、电压
B、电流
C、电动势
D、电功率
答案是:B
由于正弦量与相量存在对应关系,所以相量等于正弦量。
A、正确
B、错误
答案是:错误
正弦量的三要素是指它的最大值、角频率和初相位。
A、正确
B、错误
答案是:正确
正弦量的初相角与起始时间的选择有关,而相位差则与起始时间无关。
A、正确
B、错误
答案是:正确
非正弦周期信号是指不按正弦规律变化的周期性交流信号。
A、正确
B、错误
答案是:正确
我国使用的交流电频率为60Hz。
A、正确
B、错误
答案是:错误
通常所说的交流电压220V是指它的
A、有效值
B、平均值
C、最大值
D、最小值
答案是:A
在电阻元件的交流电路中,电压和电流的相位
A、相同
B、电压的相位比电流的相位超前90°
C、电压的相位比电流的相位落后90°
D、不确定
答案是:A
某三相四线制供电电路中,相电压为220V,则火线与火线之间的电压为
A、220V
B、311V
C、380V
D、110V
答案是:C
频率是反映交流电变化的
A、位置
B、快慢
C、大小
D、方向
答案是:B
在RLC串联电路中,如果调大电感,则电路
A、容性增强
B、感性增强
C、呈电阻性
D、性质不变
答案是:B
半导体的导电能力介于导体与绝缘体之间,硅和锗是最重要的两种半导体材料。
A、正确
B、错误
答案是:正确
在半导体中,自由电子和空穴都是载流子。
A、正确
B、错误
答案是:正确
P型半导体的多数载流子是空穴,因此P型半导体带正电。
A、正确
B、错误
答案是:错误
三极管的交流放大倍数和直流放大倍数是两个不同的概念,但其值近似相等。
A、正确
B、错误
答案是:正确
N型半导体的多数载流子是自由电子,因此N型半导体带负电。
A、正确
B、错误
答案是:错误
由理想集成运放的电压放大倍数Aod=∞,可得ui=u+-u-=0。说明运放输入端
A、短路
B、断路
C、相当于短路
D、相当于断路
答案是:C
一个理想变压器,已知初级电压为100V,初级匝数N1=100,为得到10V的次级电压,则次级匝数N2为 ( ) 匝。
A、10
B、20
C、30
D、40
答案是:A
为使集成运放工作在线性区,电路中应引入
A、正反馈
B、电压反馈
C、电流反馈
D、负反馈
答案是:D
变压器初级绕组的输入功率( )次级绕组的输出功率。
A、大于
B、可能小于也可能等于
C、小于
D、等于
答案是:A
对三极管放大作用的实质,下面说法正确的是
A、三极管可以把小能量放大成大能量
B、三极管可以把小电流放大成大电流
C、三极管可以把小电压放大成大电压
D、三极管可用较小的电流控制较大的电流
答案是:D
在社会主义市场经济条件下,正确处理好个人利益同社会利益、集体利益、国家利益之间关系的基本原则是()。
A、个人主义
B、民族主义
C、集体主义
D、小团体主义
答案是:C
公民依法投票选举人大代表,享受了选举权,这是( )。
A、法律执行
B、法的遵守
C、法律制定
D、法律适用
答案是:B
一个国家的全部现行法律规范组合为不同的法律部门而形成的有机联系的统一整体,称为( )。
A、法律部门
B、法律体系
C、法学体系
D、法律汇编
答案是:B
社会公德涵盖了()之间的关系
A、人与人
B、人与社会
C、人与自然
D、人与人、人与社会、人与自然
答案是:D
下列选项中,( )被称为是我国的国体。
A、人民民主专政
B、工人阶级领导
C、人民代表大会
D、民主协商
答案是:A
有序的公共生活对进社会健康发展具有重要意义。由一定规则维系的人们公共生活的有序化状态,称为()。
A、公共秩序
B、公共领域
C、公共道德
D、公共场所
答案是:A
中华民族在五千多年的发展中形成的伟大民族精神的核心是( )。
A、团结统一
B、爱好和平
C、爱国主义
D、国际主义
答案是:C
中华民族精神的核心是( )。
A、团结统一
B、爱好和平
C、爱国主义
D、自强不息
答案是:C
在诸多法律权利中,()是最基本的。
A、人身权利
B、经济权利
C、实体性权利
D、程序性权利
答案是:A
在社会生活中,人生实践体现出一些价值。其中,个体的人生活动对自身的生存和发展所具有的价值,指的是人生的( )
A、自我价值
B、群体价值
C、外在价值
D、社会价值
答案是:A
A: Sorry,I can.t follow you. Would you mind saying that slowly? B: Certainly not.
A、正确
B、错误
答案是:错误
A: May I put my books here? B: Yes, put them please.
A、正确
B、错误
答案是:错误
A: Tom speaks English very well. B: So he does.
A、正确
B、错误
答案是:正确
A: Have a wonderful time. B: You, too.
A、正确
B、错误
答案是:正确
A: May I play basketball after supper? B: No, you mustn.t.
A、正确
B、错误
答案是:正确
A: Have a nice weekend! B: The same to you.
A、正确
B、错误
答案是:正确
A: Can you do this for me, please? B: No, thanks.
A、正确
B、错误
答案是:错误
A: You know, I have three kids now. B: That.s terrific.
A、正确
B、错误
答案是:正确
A: Excuse me, can I smoke here? B: No.
A、正确
B、错误
答案是:错误
A: Do you think I can use your computer for one day? B: No you can.t.
A、正确
B、错误
答案是:错误
How many books do you have? I have ______ book.That.s ______ English book.
A、a,an
B、a,one
C、on,an
D、one,one
答案是:A
______ girl over there is ______ popular student in our school.
A、A,an
B、The,a
C、The,the
D、A,the
答案是:B
Father often tells ______ a story on the bed.
A、us
B、we
C、I
D、they
答案是:A
It was very hot yesterday, but it is ______ today.
A、even hotter
B、more hotter
C、much more hot
D、much hot
答案是:A
When we speak to people, we should be ______.
A、as polite as possible
B、as polite as possibly
C、as politely as possib
答案是:A
______ Chemistry teacher is Mr.Lin.
A、We
B、Us
C、Our
D、Ours
答案是:C
I often watch ______ TV in ______ evening.
A、a,the
B、an,the
C、/,the
D、/,a
答案是:C
He found ______ wall.There was ______ “s”on the corner of ______ wall.
A、a,an,the
B、a,a,the
C、an,an,an
D、the,a,a
答案是:A
There is ______ old book.______ old book is Doctor Wang.s.
A、an,The
B、the,An
C、a,The
D、the,The
答案是:A
Bob runs ______ fast as Jim.
A、as
B、so
C、for
D、from
答案是:A
What’s ______ the box?
A、in
B、on
C、at
D、for
答案是:A
May ______ speak to Jack?
A、I
B、me
C、us
D、we
答案是:A
His father began to work ______ he was seven years old.
A、as old as
B、as early as
C、as soon as
D、as much as
答案是:B
______ apple everyday keeps you healthy.
A、The
B、A
C、An
D、Two
答案是:C
He came to Chongqing ______ 2000.
A、on
B、of
C、to
D、in
答案是:D
The reason _____ he was late for the meeting is _____ his car broke down on the road.
A、why; that
B、why; because
C、th
答案是:A
A group of American soldiers were walking along the road in Irap when a bomb was _____, three of whom were killed.
A、se
答案是:D
Even today, the south is _________ behind the rest of theUnited Statesin areas like education and economic development.
答案是:B
A: How long have you been here?
B: Not for long, only about five minutes. Alice and Monica ______ here with me.
A、have
答案是:D
—It took me ten years to build up my business, and it almost killed me.
—Well, you know what they say. _____.
A、There
答案是:D
—I knocked over my coffee cup. It went right over _____ keyboard.
—You shouldn’t put drinks near _____ computer.
A、the
答案是:B
Drive _____ until you come to the small town, which lies about 100 kilometers _____ London.
A、north; to the east
B、nor
答案是:B
---I think we’ve met somewhere before.
---No, _________.
A、it isn’t likely
B、it can’t be true
C、I would rather no
答案是:B
It’s quite different from _____ I read last month.
A、that
B、which
C、the one
D、the one what
答案是:C
---I hear Faulen has taken up his business in London.
---Really? He has no business _________ and I’m sure he’ll f
答案是:B
A: What do you do, Polly? B: I work for an IT company.
A、正确
B、错误
答案是:正确
A: Hello! Are you John Smith? B: Yes, I am.
A、正确
B、错误
答案是:正确
It’s a hard job.
A、正确
B、错误
答案是:正确
Do you want some milk?
A、正确
B、错误
答案是:正确
A: What.s the date today? B: It.s April 1st.
A、正确
B、错误
答案是:正确
Jan works in a bank. She like work very much.
A、正确
B、错误
答案是:错误
A: Hello, Bob. How.s everything? B: That.s all right.
A、正确
B、错误
答案是:错误
The girl teaches us drawing on Sundays.
A、正确
B、错误
答案是:正确
Two mineral water, please.
A、正确
B、错误
答案是:错误
She often go to Nanjing.
A、正确
B、错误
答案是:错误
I saw many ______ in the hall.
A、peoples
B、people
C、people’s
D、people.es
答案是:B
A hunter is a man who ___ animals.
A、catch
B、catches
C、will catch
D、was catching
答案是:B
There ______ some chopsticks on the table.
A、are
B、is
C、have
D、was
答案是:A
You need ______ good care of your mother.
A、to take
B、take
C、taking
D、took
答案是:A
The athlete.s years of hard training __________ when she finally won the Olympic gold medal.
A、went on
B、got through
答案是:C
It.s the second time that I __________ in Shanghai ! What great changes have taken place in Shang Hai. It is ten years s
答案是:A
If someone calls me, ask him or her to leave a ______ .
A、message
B、letter
C、sentence
D、notice
答案是:A
I will visit you if Father ___ me.
A、let
B、lets
C、is letting
D、will let
答案是:B
You should ______ smoking.
A、grow up
B、pick up
C、give up
D、set up
答案是:C
She ______ TV alone.
A、watches
B、watch
C、watching
D、watched
答案是:A
Tom isn’t outgoing. Neither ______ Mary.
A、does
B、is
C、do
D、did
答案是:B
How much ______ that pants?
A、are
B、is
C、cost
D、costs
答案是:B
I don.t need ______ the doctor.
A、see
B、to see
C、seeing
D、saw
答案是:B
How many ______ would you like?
A、paper
B、bread
C、pieces of papers
D、pieces of bread
答案是:D
How many ______ do you have every week?
A、classes
B、class
C、work
D、works
答案是:A
A: How is your father? B: He has passed away. A: Really?
A、正确
B、错误
答案是:错误
What was Mary doing yesterday?
A、正确
B、错误
答案是:错误
A new bridge has been built on Xin.an River.
A、正确
B、错误
答案是:错误
The teacher tell us to practise every day.
A、正确
B、错误
答案是:错误
My father is cooking Chinese food now.
A、正确
B、错误
答案是:正确
Where do you have lunch every day?
A、正确
B、错误
答案是:正确
He will help his colleage with her job.
A、正确
B、错误
答案是:正确
He is less careful than his sister.
A、正确
B、错误
答案是:正确
A: Must I take a taxi? B: No, you must not. You can take a bus.
A、正确
B、错误
答案是:错误
I doesn.t understand the doctor.
A、正确
B、错误
答案是:错误
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