【单选题】
___This is Mr Smith speaking now.
A. Who are you
B. Who is that
C. Who are you calling
D. What do you want to say
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答案
B
解析
暂无解析
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A. Don't worry about it.
B. Congratulations! That's a difficult course.
C. Mr. Brown is very good.
D. Good luck to you!
【单选题】
-Would you go to the concert with me?___, but I'm very busy now.
A. I'd like to
B. Sure
C. No problem
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【单选题】
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A. I have no time
B. I'd rather not
C. You can leave
D. I'd be happy to
【单选题】
- Hi, Jim! Nice to meet you.____.
A. Certainly
B. Many thanks
C. OK
D. Nice to meet you, too
【单选题】
- Hello, may I speak to Mike?_____
A. Who are you?
B. Sorry, he isn't in.
C. Thank you very much.
D. Yes, here you are.
【单选题】
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A. No, I won't
B. Yes, with pleasure
C. Yes, please
D. Yes, help yourself
【单选题】
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A. I'm so glad
B. I'm sorry
C. What a pity
D. Surprisingly
【单选题】
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A. her teacher worked hard.
B. Susan worked hard.
C. the teacher was surprising.
D. Susan was surprised.
【单选题】
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A. It doesn't matter
B. I can't do it
C. Don't worry
D. Sorry, I won't do it again
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A. It went very well.
B. I flew there.
C. I love Paris.
D. Thank you for asking.
【单选题】
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A. All right
B. That's right
C. Not at all
D. Never mind
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- Happy birthday to you! ___!
A. Happy birthday to you
B. I'm very glad
C. That's all right
D. Thank you
【单选题】
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A. Yes, I like basketball a lot
B. It's far too crowded
C. Yes, I'm crazy about it
D. Oh, it's funny
【单选题】
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A. don't you
B. haven't you
C. shall we
D. will you
【单选题】
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A. Me too
B. Yes,I'll be free then
C. That's all right
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【单选题】
— Write to me when you get home. OK, I ______.
A. must
B. should
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【单选题】
Tom is so talkative. I’m sure you'll soon get tired ___ him.
A. of
B. with
C. at
D. on
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A. what
B. how
C. which
D. /
【单选题】
___ is your girl friend like? She is very kind and good-looking.
A. How
B. What
C. Which
D. Who
【单选题】
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A. insisted on
B. insisted at
C. insisted that
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A. of
B. into
C. to
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A. like
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C. near
D. similar
【单选题】
He ___lives in the house where he was born.
A. already
B. yet
C. still
D. ever
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A. in
B. at
C. on
D. to
【单选题】
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A. appeared
B. happened
C. occurred
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Measles (麻疹) ___ a long time to get over.
A. spend
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C. take
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A pair of spectacles ___ what I need at the moment.
A. is
B. are
C. has
D. have
【单选题】
— Five days ___ too long for me to wait.
A. was
B. were
C. is
D. are
【单选题】
You had better ___ a doctor as soon as possible.
A. seeing
B. saw
C. see
D. seen
【单选题】
The boy is not happy at the new school. He has ___ friends there.
A. few
B. a few
C. little
D. a little
【单选题】
I fell and hurt myself while I ___ basketball yesterday.
A. was playing
B. am playing
C. play
D. played
【单选题】
Tom ___ more than twenty pounds on the novel.
A. spent
B. paid
C. cost
D. took
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A. to have closed
B. to close
C. having closed
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A. quickly
B. wrongly
C. bitterly
D. seriously
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A. wide
B. so wide
C. wide enough
D. enough wide
【单选题】
We’ve missed the last bus. I'm afraid we have no ___but to take a taxi.
A. way
B. choice
C. possibility
D. selection
【单选题】
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A. less intelligent
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【单选题】
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A. clearly
B. clarity
C. clear
D. clearing
【单选题】
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A. is
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A. or
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57对频率稳定度要求较高的振荡器,要采用: ___ 。
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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 ___ 。
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2数字集成门电路,目前生产最多应用最普遍的门电路是___
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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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【单选题】
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C. 7
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A. 29
B. 57
C. 4
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A. 18V
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C. 3V
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A. 图
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C. 图
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A. 1+1=10
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D. A·=1
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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
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【单选题】
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A. OC门
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【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___。
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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___。
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C. 异或
D. 同或
【单选题】
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B. 正非门
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D. 负或门
【单选题】
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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
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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】
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A. 1+A=A
B. A+A=1
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D. A+AB=A
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A.
B.
C.
D.
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B. A+C
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A. 5421BCD码
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B. 2
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28十进制数25用8421BCD码表示为___。4位
A. 10 101
B. 0010 0101
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30与八进制数(47.3)8等值的数为___
A. (100111.011)2
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D. (100111.11)2
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31下列各型号中属于优先编码器是___。
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B. 74LS138
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C. 共阳极LCD管
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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___。
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C. 4个
D. 8个