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什么叫扩散通风?采用扩散通风有什么限制?

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A customer has one IBM System Storage DS8300 in their main data center with one IBM DS6800 at their Disaster Recovery (DR) site. They are using the Remote Mirror and Copy (RMC) feature between the sites. They utilize Tivoli Storage Manager for backups. They would like to replace a Microsoft Windows server at the main site with a server at the DR site with a minimal amount of downtime. Which method will achieve their goals()

A. locate the Tivoli Storage Manager data set for the server at the DR site, do a full backup, recover the data to the DS6800, and make the data availableto the server
B. create RMC relationships for all of the data on the server to the DS6800, shut down the server, and make the data available to the new server
C. shut down the server,create RMC relationships for all of the data on the server to the DS6800, and make the data available to the new server
D. recover the TSM backups to the DS6800 at the remote site, and make the data available to the new server

与傅立叶算法相比,最小二乘法有何特点?

甲型H1N1流感在墨西哥发现以来,逐步在全球范围内蔓延。截止2009年7月1日,世界卫生组织确认全球117个国家和地区共有70893例确诊病例,其中死亡311例。我国内地从第一例甲型H1N1流感病例到100例,用时一个月;从100例发展到近200例,用时仅5天。甲型H1N1流感疫情一度引起全球性恐慌,世界卫生组织一度将疫情警戒级别升至最高级6级。疫情在一定程度上影响了全球经济的复苏进程。上题中所指的风险管理方法之所以未被采纳,主要是因为()。

A. 这种方法对外国人不够友好
B. 没有人在第一时间想到这种方法
C. 这种方法自身存在明显的局限性
D. 这种方法容易被人模仿而失效

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