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从事生产或者供应生活饮用水需要办理卫生许可证吗？

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2000A型无绝缘轨道电路能够实现对调谐单（）故障的检查。

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有光刻胶覆盖硅片的三个生产区域分别为光刻区、刻蚀区和扩散区。

A. 正确
B. 错误

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You have an Exchange Server 2010 organization that contains five Mailbox servers and five Client Access servers.All users in the organization connect to their mailboxes by using Outlook Anywhere.You create a Client Access server array.You need to ensure that all users can connect to the Client Access server array.What should you do？（）

A. From the Exchange Management Shell， run the Set-Mailbox cmdlet
B. From the Exchange Management Shell， run the Set-MailboxDatabase cmdlet
C. From the Exchange Management Console （EMC）， modify the properties of each mailbox database
D. From the Exchange Management Console （EMC）， modify the properties of each Client Access server object

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交流电磁线圈中通入直流电会发生什么现象？

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