基本的DMA控制器的主要部件有哪些?

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问题:

基本的DMA控制器的主要部件有哪些?

考点:计算机硬件维修工程师计算机硬件维修工程师题库
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阅读理解。

     After staying in Beijing, it was time to go to Shanghai. So I decided to take the train to Shanghai and stop

halfway at Tai'an for a day to break up the trip and climb Mount Tai. The train arrived in the city at 10 pm.

It was late and I was tired. I started to walk around the city to look for a hotel, but I couldn't find a reasonable(合理的) one. Something was strange. There were so many Chinese tourists walking somewhere. I finally

followed them to see what all the excitement was about. As it turned out, they were all climbing the mountain

to reach the top by sunrise. What a crazy idea!

     I later found out it was the thing to do, so having no luck with hotels, I decided I had better join them. And

maybe because of the dark, I didn't have to pay for any entry fees (费). Of course the first thing was to find if

the mountain had a wall around it. Of course it did. And the second, it had a paved (用砖铺的) path and road

all the way up to the top. Anyway, I ran up the mountain and made it to the top by about 4:30 am. I relaxed a

little and watched the sunrise. Nothing was special. Everyone was cheering so I guessed it was worth it.

1. The writer took a trip to Mount Tai ______.

A. from Shanghai

B. by plane from Beijing

C. on his way to Shanghai

D. in his dream at night

2. When did he get to the city of Tai'an?

A. 9 pm.

B. 10 pm.

C. 11 pm.

D. I don't know.

3. Why did the writer climb the mountain at night? Because ______

A. he liked to walk at night.

B. he could pay half of the fees at night.

C. the Chinese tourists told him to follow them.

D. he hadn't found a suitable hotel.

4. What does the underlined"a crazy idea" refer to?

A. That the write got to the tain station at 10 pm.

B. That the tourists climbed the mountain at night to reach the top by sunrise.

C. That there were no suitable hotels in such a famous place

D. That people in Tai'an work all the time without sleeping at night.

5. The possible title of the passage is "_______".

A. A trip to Mount Tai.

B. No hotel to stay in.

C. The famous place between Beijing and Shanghai.

D. Why do the tourists climb Mount Tai at night?

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患者,女性,43岁,左前臂车祸后骨折,拟行保守治疗,给予石膏管型固定,5小时后出现患肢持续性剧痛,进行性加重,肤色苍白,桡动脉搏动减弱。

此时患者出现了哪项并发症()。

A.化脓性皮炎

B.骨折断端移位

C.压疮

D.石膏综合症

E.骨筋膜室综合症

题型:问答题 简答题

电动机是一种______能转化为______能的装置.电动机的______与______之比叫做电动机的效率.由于电动机运行中总有______,所以其效率不可能达到______%.如图所示是测定电动机效率的实验示意图,请在图上连接实验电路.本实验要测定的物理量是______,计算电动机效率的表达式是______(用上面要测定的物理量的字母表示).

题型:问答题 简答题

如果x=1是关于x的方程-x+a=3x-2的解,则a的值为(  )

A.1

B.-1

C.2

D.-2

题型:问答题 简答题

若遇见执行器的保护功能工作,应分析原因,切忌()操作执行器,以免损坏设备。

A、停止

B、顺时

C、远程

D、反复

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