问题 问答题 简答题

什么叫模数转换器?

答案

参考答案:

模数转换器(analog to digital converter)是能将模拟量转换成数字量的器件,简称ADC或A/D。模数转换器是利用数字系统分析、处理、控制模拟信号的桥梁。被分析处理的对象—般多为物理量,如温度、压力、位移、速度等。因此,它在需要应用数字技术和计算机技术对模拟信息进行分析、处理和控制的各个领域中得到广泛应用。

完形填空
My family came to America in 1985.  _21_ of us spoke a word of English. Each morning
I disliked going to school for fear of not __22__what people were saying.
Very soon my mother noticed something was__23__me. The pain and care I saw in her
moon­shaped eyes made me burst into tears.  I explained to her the __24__I had of going to school. “Learning English is not __25__,” my mother said. She cheerfully __26__the two of us work together to learn the language at home. The__27__and determination my mother had were admirable because English was as __28__ to her as it was to me.
That afternoon,I saw my mother in a different light as she __29__me by the school
fence. She was the shortest of all the mothers there,  30   , her face with her welcoming smile and big,black eyes was the most __31__. The afternoon sun shone__32__on her long,black hair creating an atmosphere that made her different from others.
My mother and I immediately began reading together and __33__five new words a
day. My mother,with her encouraging attitude,made the routine (惯例) fun and interesting. The fact that she was sacrificing (牺牲) her__34__ time before going to work so that I could learn English made me see the __35__she owned. Very soon I began to understand what everyone was saying.
小题1:
A.AllB.OneC.SomeD.None
小题2:
A.hearing B.masteringC.understandingD.noticing
小题3:
A.changingB.disappointingC.hurting D.troubling
小题4:
A.fear B.emotionC.senseD.difficulty
小题5:
A.dull B.necessaryC.impossibleD.good
小题6:
A.decidedB.suggestedC.promisedD.allowed
小题7:
A.wishB.considerationC.confidenceD.progress
小题8:
A.new B.strangeC.familiar D.good
小题9:
A.sent for B.picked upC.waited forD.looked for
小题10:
A.soB.butC.because D.however
小题11:
A.hopeful B.relaxingC.confusingD.exciting
小题12:
A.directlyB.brightlyC.slightlyD.clearly
小题13:
A.discussingB.reviewingC.rememberingD.writing
小题14:
A.working B.shoppingC.learning D.resting
小题15:
A.determination B.sadnessC.joke D.modesty
名词解释