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混凝土基础与砖基础的宽高比容许值各为多少？假如混凝土基础实际宽高比为1：2，是否安全？如果安全，那又有何缺点？

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管理宽度原理

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空气压缩机风包上必须装有可靠的（）和（），并有检查孔。

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乙烯氧化生产的含环氧乙烷的气体首先采用（）分离。

A. 吸收
B. 精馏
C. 结晶
D. 萃取

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You have an Exchange Server 2010 organization that contains three Mailbox servers.All Mailbox servers are members of a database availability group （DAG） and have a public folder database.The Active Directory forest contains one site.You create a new site and install new Exchange Server 2010 servers in the site.You need to ensure that public folders are stored on servers in both sites.What should you do？（）

A. Create a public folder database on a server in the new site. Modify the replication settings for all public folders
B. Create a public folder database on a server in the new site.Run the Set-DatabaseAvailabilityGroup cmdlet from a server in the new site
Configure clustered continuous replication （CCR） on two servers in the new site. Modify the replication settings for all public folder databases
D. Configure standby continuous replication （SCR） on a server in the new site. Run the Enable-StorageGroupCopy cmdlet from a server in the new site

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