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【简答题】
阅读理解。 Time spent in a bookshop can be most enjoyable, whether you are a book-lover or merely you are there to buy a book as a present. You may even have entered the shop just to find shelter from a sudden shower. Whatever the reason, you can soon become totally unaware of your surroundings. You soon become engrossed in some book or other, and usually it is only much later that you realise you have spent far too much time there and must dash off to keep some forgotten appointment-without buying a book, of course. This opportunity to escape the realities of everyday life is, I think, the main attraction of a bookshop. There are not many places where it is possible to do this. You can wander round such places to your heart's content. If it is a good shop, no assistant will disturb you with usual greetings,'Can I help you, sir?' Of course you may want to find out where a particular section is. Then, and only then, are his services necessary. However, when he has led you there, the assistant should retire carefully and look as if he is not interested in selling a single book. You have to be careful not to be attracted by the variety of books in a bookshop. It is very easy to enter the shop looking for a book on ancient coins and to come out carrying a copy of the latest best-selling novel. This sort of thing can be very dangerous. Apart from running up a huge account, you can waste a great deal of time wandering from section to section. 1. Which may not be included in the writer's experiences while he is in a bookshop? A. Getting relaxed without buying a book. B. Quarrelling with the shop assistant. C. Buying other books instead of those he wanted. D. Forgetting some important appointment. 2. What does the writer mean by saying 'time spent in a bookshop can be most enjoyable'? A. You may free yourself from the real life. B. Reading is free of charge there. C. There is nobody disturbing you there. D. You can enter without any certain reason. 3. What does the underlined word engrossed most probably mean in the first paragraph? A. Lost. B. Forbidden. C. Puzzled. D. Impressed. 4. The writer wrote the passage in order to _____. A. suggest a good way of running a bookshop B. encourage people to do some reading in bookshops C. share his experience in bookshops D. give some advice on buying books in a bookshop
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【单选题】设8255A的A口工作于方式0输入,B口工作于方式1输出,则控制方式字为( )
A.
10010100B
B.
00010100B
C.
10010110B
D.
10000110B
【判断题】边际消费倾向和平均消费倾向总是大于0而小于1的。
A.
正确
B.
错误
【简答题】若要使8255A的A组和B组均工作于方式0,且使端口A为输入,端口B为输出,端口C为输入,需设置控制字为 H。
【简答题】设 8255A的A口工作于方式0输入,B口工作于方式1输入。 (1) 编写初始化程序(设端口地址为CC90~CC93H)。 (2)编写程序使C口PC5输出高电平,然后从B口输入数据到累加器。
【多选题】8255A的A口工作于方式1输入时,能向CPU发出中断请求信号的条件包括( )。
A.
选通信号 =1
B.
输入缓冲器满信号IBF=1
C.
中断允许控制 INTE=1
D.
外设的应答信号 =0
【判断题】边际消费倾向和平均消费倾向总是大于0而小于1 。( )
A.
正确
B.
错误
【单选题】设8255A的A口工作于方式0输入,B口工作与方式1输出,则控制方式字为:
A.
10010100B
B.
00010100B
C.
10000110B
D.
10010110B
【单选题】设8255A的A口工作于方式0输入,B口工作与方式1输出,则控制方式字为:
A.
10000110B
B.
00010100B
C.
10010110B
D.
10010100B
【简答题】对8255A进行初始化,要求端口A工作于方式1,输入;端口B工作于方式0,输出;端口C的高4位配合端口A工作,低4位为输入。设控制口的地址为006CH。
【简答题】设8255芯片的接口地址范围为03F8H~03FBH,A组B组均工作于方式0,A口作为数据输出口,C口低4位作为控制信号输入口,其他端口未使用。试画出该片8255芯片与系统的电路连接图,并编写初始化程序。
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