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【单选题】
根据下列文章,请回答 46~50 题。 Good Writing Like fine food。good writing is something we approach with pleasure and enjoy from the first taste to the last.__________ (1) Quite the contrary, just as the cook has to undergo an intensive training,mastering the skills of his trade,the writer must sit at his desk and devote long hours to achieving a style. in his writing,whatever its purpose--school work,matters of business,or purely social communication.__________ (2) There are still some remote places in the world where you might find someone to do your business or social writing for you,for a fee.There are a few managers who are lucky enough to have the service of that rare kind of secretary who can take care of all sorts of letter writing with no more than a quick note to work from.__________ (3) We have to write school papers,business papers or home papers.We are constantly called on to put words to paper.It would be difficult to count the number of such words,messages,letters。and reports put to the mails or delivered by hand,but the daily figure must be enormous.__________ (4)We want to arouse and hold the interest of readers.We want whatever we write to be read,from first word to last。not thrown into some “letters-to-be-read” file or into a wastepaper basket.__________ (5)
A.
But for most of US,if there is any writing to be done,we have to do it ourselves.
B.
However, the managers may sometimes cause the writers a lot of trouble.
C.
Any good writers,like good cooks,do not suddenly appear full-blown(成熟的).
D.
What is more,everyone who writes expects,or at least hopes,that his writing will be read.
E.
This is the reason we bend our efforts toward learning and practicing the skills of interesting,effective writing.
F.
You may be sure that the greater the effort,the more effective the writing,and the more rewarding. 第 46 题 请选择(1)处最佳答案。
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正确
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错误
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正确
B.
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【单选题】某机器I/O设备采用异步串行传送方式传送字符信息,字符信息格式为1位起始位、8位数据位、1位校验位和1位停止位,若要求每秒钟传送640个字符,那么该设备的有效数据传输率应为()。
A.
640b/s
B.
640B/s
C.
6400B/s
D.
6400b/s
【判断题】在三相半波可控整流电路中,若出发脉冲在自然换相点之前加入,输出电压波形将变为缺相运行。
A.
正确
B.
错误
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A.
正确
B.
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【单选题】正常成人血清钠浓度范围约为
A.
100~120mmol/L
B.
120~130 mmol/L
C.
170~190 mmol/L
D.
150~170 mmol/L
E.
130~150 mmol/L
【简答题】下列可控整流电路中,输出电压谐波含量最少的是(    )电路。 a.三相半波    b.单相双半波    c.三相桥式    d.十二相整流
【单选题】正常成人血清钠浓度范围约为
A.
100~120mmol/L
B.
120~130 mmol/L
C.
170~190 mmol/L
D.
150~170 mmol/L
E.
135~150 mmol/L
【判断题】安装锯条时,齿尖的方向应该朝前。
A.
正确
B.
错误
【判断题】在三相半波可控整流电路中,若触发脉冲在自然换相点之前加入,输出电压波形变为缺相波形。
A.
正确
B.
错误
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