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公路隧道空气污染造成危害的主要原因是(),用通风的方法从洞外引进新鲜空气冲淡一氧化碳的浓度至卫生标准,即可使其他因素处于安全浓度。

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.Your companys virtual environment includes Windows Server 2008 R2 Hyper-V servers. You manage the environment by using Microsoft System Center Virtual Machine Manager (VMM) 2008 R2. You need to provide a user with the ability to perform only the Create, Delete, Start, Stop, Pause, Resume, and Shut Down virtual machine (VM) management tasks on your host servers . What should you do?()

A. In VMM,create a Self-Service user role.
B. In VMM,create a Delegated Administrator user role.
C. In VMM,assign the Local Administrator permission for the host servers to the user.
D. In Authorization Manager, create a role on the users client computer and add the user to this role.

App_Data目录用来放置()。

A. 共享的数据库文件
B. 共享文件
C. 被保护的文件
D. 代码文件

学校的基本单位是年级。()

A. 正确
B. 错误

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