阅读以下关于分布式存储系统设计的叙述,回答问题1至问题3。某软件公司开发基于云计算的

题型:问答题 案例分析题

问题:

阅读以下关于分布式存储系统设计的叙述,回答问题1至问题3。

某软件公司开发基于云计算的分布式文档协作平台(DDCP),系统部分需求如下所述:

(1)实现文档的分布式存储,客户端可随时随地上传和下载文档;

(2)支持多客户端并发编辑同一文档,某个客户端所做修改会实时显示在其他客户端;

(3)要求系统具有自我修复机制,当系统中某个节点失效时,无需人工干预能够自动实现节点替换并恢复到一致状态。

项目组经过讨论,决定采用现有的分布式文件系统作为基础架构,但在具体选用哪种设计方案时产生了分歧。王工建议采用Hadoop分布式文件系统HDFS作为系统参考架构,但张工认为Google分布式文件系统GFS更适合该系统需求。最后经过更为详细的分析和讨论,同意了张工的建议,采用GFS作为分布式文档协作平台的文件系统架构。

针对图2-1所示DDCP基础架构,请分别说明一次数据读操作和一次并发写操作的过程。

考点:计算机软件水平考试高级系统分析师2011年计算机技术与软件专业技术资格高级系统分析师上半年下午试卷
题型:问答题 案例分析题

在利用显微镜观察细胞结构时,与物像明暗程度无关且可调节的结构是

A.反光镜

B.光圈

C.细准焦螺旋

D.通光孔

题型:问答题 案例分析题

王磊同学在实验室测量标有“2.5V”字样的小灯泡的额定功率。

⑴他连接的部分实验电路如图所示。请你用笔画线代替导线,帮助他完成电

路连接。

⑵开关S闭合前,应把图中滑动变阻器的滑片P置于     (选填“A”或“B”)端。

⑶灯泡L正常发光时,电流表的示数如图所示,灯泡的额定功率为     W。

题型:问答题 案例分析题

Try and see inside your mind a wide open blue sky and a wide green sea far away. Breathe in as you circle your hands high above your head, then bend back a little. Breathe out as you circle your arms back down to your sides..."

Following the yoga teacher's gentle instructions, Bai Yunuo,15, from the High School attached to Beijing Normal University tried to get each of her poses correct.

Bai's school offered 24 elective courses (选修课) for Senor 1 students this term and she chose two. It was her first yoga class.

"I'm happy that I can learn yoga at school. I love dancing but I had some injuries on my knees when I was a kid. So I decide to try something soft. Simply stretching into different poses makes me feel free and quiet. And the music is quite comforting. The class is relaxing after a whole day's work," Bai said.

Liu Zehao,15, found his interest was Junior Achievement (企业经营模拟). The course brought students into the real world of business. In their first class, Liu and his group members named their company "Vision". Liu was elected as CEO of the company.

"Here we learn to think like an adult. We have to make our company get more money. It's new and different from other courses," he said.

Liu and Bai take their elective courses twice a week with students from other classes who share the same interest. The students will get two credits (学分) from each course at the end of this term. They have to achieve eight credit points from electives to graduate from high school.

If you are interested in more about elective courses, please CLICK HERE to register for general elective courses.

小题1: What’s the main idea of the first paragraph?

A.Skills for imagination.

B.Learning tips.

C.Instruction for yoga students.

D.Breathing rules.小题2:What can be inferred from the passage?

A.Bai does not like dancing.

B.Yoga is softer than dancing.

C.Students study hard for credits.

D.The elective courses are easy.小题3: Which of the sentence is NOT true about Liu Zehao?

A.He was interested in Junior Achievement which brought him the real world of business.

B.He was elected as CEO of the company named "Vision".

C.He was an adult and he tried to make more money for his company.

D.He took their Junior Achievement twice a week.小题4:Where can you possibly find this passage?

A.A textbook

B.A newspaper

C.A magazine

D.The internet

题型:问答题 案例分析题

业务流程图、数据流程图、数据字典、系统流程图、模块结构图是结构化信息系统分析与设计中使用的几种主要的工具,以下是关于这几种工具之间关系的描述。
Ⅰ.数据流程图是通过对业务流程图抽象得到的
Ⅱ.系统流程图是由数据流程图导出的
Ⅲ.模块结构图是由数据流程图导出的
Ⅳ.数据字典只是对数据流程图中数据元素和组合数据的具体描述
Ⅴ.系统流程图是对应于系统分析阶段的抽象数据流程图的物理数据的流程图
以上描述中错误的是( )。

A.Ⅰ、Ⅱ

B.Ⅱ、Ⅳ

C.Ⅳ、Ⅴ

D.Ⅲ、Ⅴ

题型:问答题 案例分析题

()不受欠轴限制。

A.区段列车

B.重点摘挂列车

C.直通列车

D.直达列车

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