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【简答题】
完形填空。 There is an American story about three sisters. They loved each other very much. Each 1 could only be happy when she was with her sisters. The oldest sister stood 2 . Her name was Corn. Corn was beautiful and strong. The middle sister liked to twine (缠绕) 3 her sister Corn. Her name as 4 . As Bean grew taller, she could give Corn a 5 hug(拥抱). The youngest sister was very brave. She stayed at the 6 Of Corn and Bean to protect them from danger. Her name was Squash. When one of the sisters grew, 7 two wanted to grow. They 8 wanted to be alone. So they always 9 together in the same field. On summer nights, when stars shone in the sky, the three sisters changed into young girls. They were 10 green clothes, danced happily, and sang to their Mother Earth and their Father Sun. (     )1. A. sisters (     )2. A. small (     )3. A. in (     )4. A. Corn (     )5. A. big (     )6. A. back (     )7. A. other (     )8. A.never (     )9. A. lives (     )10. A. in B. family B. short B. around B. Bean B. bigger B. top B. the others B.always B. live B. on C. sister C. fat C. at C. Squash C. small C. middle C. the other C.often C. lived C. at D. brother D. tall D. from D. Mother D. smaller D. feet D. others D. sometimes D. living D. for
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【判断题】微机系统使用8253计数器/定时器实现纯软件方式的定时控制.( )
A.
正确
B.
错误
【单选题】8253计数/定时器内部有三个独立的计数器,这些计数器实际上是+( )。
A.
16位的减法计数器
B.
8位的加法计数器
C.
16位的加法计数器
D.
8位的减法计数器
【单选题】肺野剖划分标准,下列哪项不对
A.
肺门位于中肺野内带
B.
由内向外,肺解被分为内带、外带
C.
第2肋骨前端下缘水平线以上为上肺野
D.
第4肋骨前端下缘水平线以上为中肺野
E.
第4肋骨前端下缘水平线以下为下肺野
【单选题】肺野划分标准,下列哪项不对
A.
肺门位于中肺野内带
B.
由内向外,肺野被分为内带、外带
C.
第2肋骨前端下缘水平线以上为上肺野
D.
第4肋骨前端下缘水平线以上为中肺野
E.
第4肋骨前端下缘水平线以下为下肺野
【简答题】8253计数实验 根据表7-4连线(关电源) 输入参考代码 单步调试,按F8从Again执行到 jmp Again,观察记录CPU中相关寄存器的值,再按一下单脉冲按钮。 重复红色文字部分的操作,填写下表。 第 k 次执行到 jmp L0 状态 AL (十六进制) AH (十六进制) K=1 K=2 K=3 K=4 K=5 K=6 要求 1 、将计数器 0 的工作方式改为方式 2 (其它不变),按单...
【单选题】8253定时/计数器内部有三个独立的计数器,这些计数器实际上是()
A.
8位的减法计数器
B.
8位的加法计数器
C.
16位的减法计数器
D.
16位的加法计数器
【简答题】8253计数器实验
【简答题】8253计数实验
【判断题】8253 计数器的 6 种工作方式中方式 2 和方式 3 都可以实现分频器的作用。
A.
正确
B.
错误
【单选题】8253可以实现定时功能,若计数脉冲为1KHZ,则定时1秒的计数初值应为()
A.
100
B.
1000
C.
10000
D.
100000
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