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No matter how long your life is, you will, at best, be able to read only a few books of all that have been written, and the few you do read should include the best. It is to be expected that the selections will change with the times. Yet there is a surprising uniformity (一致) in the lists which represent the best choices of any period. What are the signs by which we may recognize a great book? The four I will mention may not be all there are, but they are the ones I’ve found most useful in explaining my choices over the years. Great books are probably the most widely read. They are not best sellers for a year or two. They are enduring best sellers. GONE WITH THE WIND has had relatively few readers compared to the plays of Shakespeare or DONQUIXOTE. It would be reasonable to estimate that Homer Iliad has been read by at least 25,000,000 people in the last 3000 years. Great books are popular, not pedantic(卖弄学问的). They are not written by specialists about specialties for specialists. Whether they are philosophy or science, or history or poetry, they treat of human, not academic problems. They are written for men, not professors. To read a textbook for advanced students, you have to read an elementary textbook first. But the great books can be considered elementary in the sense that they treat the elements of any subject matter. They are not related to one another as a series of textbooks, graded in difficulty or in the technicality of the problems with which they deal. Great books are always contemporary, the most readable and instructive. Great books deal with the persistently unsolved problems of human life. There are genuine mysteries in the world that mark the limits of human knowing and thinking. Great minds acknowledge mysteries honestly. Wisdom is fortified (加强), not destroyed, by understanding its limitations. 小题1:Which is NOT the standard in the following when evaluating a great book? A.Although not a best seller for a year or two, it must be the most widely read. B.A great book can be read without any effort. C.Great books are never out of date. D.Great books will not disappoint you if you try to read them well. 小题2:According to the author, GONE WITH THE WIND is ______. A.a best seller B.disgusted by readers who like Shakespeare C.read more often than Don Quixote D.a great book 小题3:After reading the passage, we can infer that ______. A.different periods have different lists of best books because there are many books for people to choose from B.if you don’t read an elementary textbook, you may have difficulty in understanding an advanced one C.Homer Iliad must be a best seller when it came out D.great books often deal with unsolved problems of human life for the writers have confidence in settling them 小题4:The best title for this passage is ______. A.Great Books in Your Life B.Great Books in Your Specialty C.How to Find a Great Book? D.What Is a Great Book?
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举一反三
【单选题】光耦合器是以光为媒介,用来传输电信号,能实现( )的转换。
A.
光-电-光
B.
电-光-电
C.
光-光-电
D.
电-电-光
【单选题】CCD是ChargecoupleDevlice的缩写,称为电荷耦合器件,它是利用微电子技术制成的表面光电器件,可以实现()转换功能。
A.
光电
B.
A/D
C.
D/A
D.
以上都不是
【单选题】光电耦合器件的主要应用是
A.
实现强弱电隔离
B.
隔直通交
C.
模数转换
D.
驱动放大
【多选题】熔植焊接强度不足的原因?
A.
电流太小
B.
焊接时间太短
C.
板面不干净
D.
搭铁不良
【判断题】由铁路组织卸车的货物应在卸车完了的当日发出催领通知。
A.
正确
B.
错误
【单选题】有关光电耦合器件优点阐述不正确的一项是
A.
光电耦合器件具有重量轻、应用电路结构简单、成本低等突出优点
B.
具有良好的线性和一定的转换速度
C.
可以实现与TTL电路的兼容
D.
耐压性高,过压不容易击穿
【判断题】尽量避免焊缝相交是为了降低生产成本。( )
A.
正确
B.
错误
【单选题】下列关于光电耦合器的叙述中,不正确的是()。
A.
光电耦合器实现了信号的光耦合和电隔离
B.
光电耦合器可以实现脉冲转换与直流电平转换,作为不同逻辑电路的接口
C.
光电耦合器的响应快、寿命长
D.
光电耦合器可以实现电→光→电双向信号传输
【简答题】光电耦合器是以( )为媒介,用来传输( )信号,能实现“电 光 电”的转换。
【简答题】光电耦合器是把发光器件和( )组装在一起,封装在一个外壳内,通过光线实现耦合构成电-光和光-电的转换器件。
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