问题 单项选择题

MCS-51单片机I/O的数据是( )

A.同步传输

B.异步传输

C.随机传输

D.实时传输

答案

参考答案:B

解析: 注意同步传输是指通讯双方在通讯之前要有握手信号,就如同我们日常生活中的电话通讯。但是单片机不是这样的,I/O和CPU的传输不需要同步。

单项选择题
翻译题

完成句子

1. Liu Xiang________in hurdle race in the 2008 Beijing Olympic Games, but unfortunately his foot was hurt badly.(win)

刘翔本可以在2008年北京奥运会跨栏项目中获得世界冠军, 但不幸的是他的脚严重受伤了.

2. Jack________his new car, which he had been dreaming of for ten years.(try)

杰克迫不及待地试驾他的新车, 这一刻他已经梦想十年了.

3. I have to draw some money from the bank before our money________.(run)

在我们的钱用完之前我得从银行取出些钱.

4. I have offered to paint the house________a week's accommodation.(exchange)

我答应粉刷这座房子以换取一个星期的膳宿.

5. ________that late movie last night, you would not be so sleepy now.(watch)

如果你昨晚没看电影到那么晚, 你现在也不会这么瞌睡.

6. It is said that many a student________freely in Mr Li's class.(convey)

据说在李老师的课上许多学生自由地表达他们所想的.

7. The doctor insisted that the patient________as soon as possible.(operate)

医生坚持病人尽可能快地动手术.

8. In the past ten years the country________an advanced industrial power.(transform)

在过去的十年, 这个国家已经变成了一个先进的工业化强国.

9. With________, it will be easy for him to finish the task on schedule.(choose)

有许多方法可供选择, 对他来说按时完成任务是很容易的.

10. The committee________five famous scientists put forward a valuable plan at the end of the conference.(make)

由五位非常著名科学家组成的委员会在会议结束时提出了一个非常有价值的计划.