某磁盘磁头从一个磁道移至另一个磁道需要10ms。文件在磁盘上非连续存放,逻辑上相邻数

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问题:

某磁盘磁头从一个磁道移至另一个磁道需要10ms。文件在磁盘上非连续存放,逻辑上相邻数据块的平均移动距离为10个磁道,每块的旋转延迟时间及传输时间分别为100ms和2ms,则读取一个100块的文件需要()ms时间。

A.10200

B.11000

C.11200

D.20200

考点:计算机软件水平考试中级软件设计师软件设计师
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单项式-
x2yz
8
的系数是______,次数是______.
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Watching some children trying to catch butterflies one hot August afternoon, I was reminded of an incident in my own childhooD.When I was a boy of 12 in South Carolina, something happened to me that cured me forever of wanting to put any wild creature in a cage.

We lived on the edge of a wood, and every evening at dusk the mockingbirds would come and rest in the trees and sing. There isn’t a musical instrument made by man that can produce a more beautiful sound than the song of the mockingbird.

I decided that I would catch a young bird and keep it in a cage and in that way would have my own private musician.

I finally succeeded in catching one and put it in a cage. At first, in its fright at being captured, the bird fluttered about the cage, but eventually it settled down in its new home. I felt very pleased with myself and looked forward to some beautiful singing from my tiny musician.

I had left the cage out on our back porch, and on the second day of the bird’s captivity my new pet’s mother flew to the cage with food in her mouth. The baby bird ate everything she brought to it. I was pleased to see this. Certainly the mother knew better than I how to feed her baby.

The following morning when I went to see how my captive was doing, I discovered it on the floor of the cage, dead. I was shocked! What had happened! I had taken excellent care of my little bird, or so I thought.

Arthur Wayne, the famous ornithologist, happened to be visiting my father at the time, hearing me crying over the death of my bird, explained what had occurred. “A mother mockingbird, finding her young in a cage, will sometimes bring it poison berries. She thinks it better for her young to die than to live in captivity.”

Never since then have I caught any living creature and put it in a cage. All living creatures have a right to live free.

64.Why did the writer catch a mockingbird when he was a boy of 12?

A.He had just got a new cage.         B.He liked its beautiful feather.

C.He wanted it to sing for him.         D.He wanted a pet for a companion.

65.The mockingbird died because it ______.

A.was frightened to death          B.ate the poisonous food its mother gave it

C.refused to eat anything            D.drank the poisonous water by mistake

66.An ornithologist probably means ______.

A.a religious person                 B.a kind person

C.a schoolmaster                   D.a expert in birds

67.What is the most important lesson the writer learned from the incident?

A.Freedom is very valuable to all creatures.

B.All birds put in a cage won’t live long.

C.You should keep the birds from their mother.

D.Be careful about food you give to baby birds.

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男,32岁,高血压3年,既往无心脏和肺部疾病和糖尿病史,查体:BP150/90mmHg,P98次/分,该患者最适宜的治疗药物为()。

A.利尿剂

B.β受体阻滞剂

C.二氢吡啶类钙通道阻滞剂

D.中枢交感神经抑制剂

E.周围交感神经抑制剂

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中国古代对妇女有四德——“德言容功”的要求,这个要求最早是由谁提出来的?

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()为特种乘车证。

A.用于到外站装卸作业及抢险的调度命令

B.全年定期乘车证

C.离休人员使用的软、硬席乘车证

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