当进程请求读磁盘时,操作系统 () 。假设磁盘每磁道有10 个扇区,移动臂位于18

题型:单项选择题

问题:

当进程请求读磁盘时,操作系统 () 。假设磁盘每磁道有10 个扇区,移动臂位于18 号柱面上,且进程的请求序列如表1 所示。那么,最省时间的响应序列为 () 。

那么,最省时间的响应序列为()

A.②③④⑤⑧①⑦⑥

B.⑥⑦①⑤⑧②③④

C.⑤⑧①⑦⑥②④③

D.⑥⑦⑧①⑤②③④

考点:计算机软件水平考试高级系统分析师计算机水平考试高级系统分析师2007年下半年上午真题
题型:单项选择题

I began to grow up that winter night when my parents and I were returning from my aunt's house, and my mother said that we might soon be leaving for America. We were on the bus then . I was crying, and some people on the bus were turning around to look at me. I remember that I could not bear the thought of never hearing again the radio program for school children to which I listened every morning.

I do not remember myself crying for this reason again. In fact, I think I cried very little when I was saying goodbye to my friends and relatives. When we were leaving I thought about all the places I was going to see-the strange and magical places I had known only from books and pictures. The country I was leaving never to come back was hardly in my head then.

The four years that followed taught me the importance of optimism, but the idea did not come to me at once. For the first two years in New York I was really lost-having to study in three schools as a result of family moves. I did not quite know what I was or what I should be. Mother remarried, and things became even more complex for me. Some time passed before my stepfather and I got used to each other. I was often sad, and saw no end to "the hard times".

My responsibilities in the family increased a lot since I knew English better than everyone else at home. I wrote letters, filled out forms, translated at interviews with Immigration officers, took my grandparents to the doctor and translated there, and even discussed telephone bills with company representatives.

From my experiences I have learned one important rule: almost all common troubles eventually go away! Something good is certain to happen in the end when you do not give up , and just wait a little! I believe that my life will turn out all right, even though it will not be that easy.

小题1:What can we learn about the author from paragraph 4?

A.She worked as a translator.

B.She attended a lot of job interviews.

C.She paid telephone bills for her family.

D.She helped her family with her English.小题2:The author believes that _________________ .

A.her future will be free from troubles

B.it is difficult to learn to become patient

C.there are more good things than bad things

D.good things will happen if one keeps trying小题3:What is the best title of the passage?

A, how I turn to be optimistic            B. I am leaving for America

C. my life in America                  D. the importance of optimism

题型:单项选择题

诊断肺癌常用最主要手段,是()

A.痰细胞学检查

B.支气管检查

C.胸部X线检查

D.胸水检查

E.经胸壁穿刺活检

题型:单项选择题

饮食中心管理信息系统在经过详细调查后,随后应该()。

A.概要设计

B.建立新系统的逻辑模型

C.详细设计

D.编码

题型:单项选择题

H2S在空气中的爆炸极限是()

A、5%~15%

B、5%~50%

C、4.32%~45%

D、4.32%~15%

题型:单项选择题

女,32岁,持续性高血压186/115mmHg,无明显阵发性血压剧升现象,平时多尿,尤以夜尿为甚,多饮,四肢乏力,行动不便,曾怀疑尿路感染,服用多种抗生素、中药及一般降血压药无明显效果,类似情况已3年余,入院检查:血常规正常,尿培养无细菌生长。血电解质:钾2.9mmol/L,钠148mmol/L,二氧化碳结合力38mmol/L,剩余碱5mmol/L,血糖6.0mmol儿,尿素氮9.3mmol儿。B超:左肾上腺有1.6cm~1.5cm占位性病变,初步诊断为左肾上腺皮质肿瘤,拟行手术治疗。

术前1~2周宜用何种药物作术前准备()

A.输血、补液

B.使用β受体兴奋剂

C.使用皮质类固醇药

D.使用α受体兴奋剂

E.补充钾离子溶液或安体舒通利尿

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