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请说出塑料绝缘类电缆分为哪几种型号以及分别适用于哪几种电压等级？

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《蒙特利尔协定》规定，到（）年必须完全停止使用氟氯烃等有害物质。

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经期小腹冷痛，喜温喜按，经量少，色黯淡，腰膝酸软，中医辨证为（）

A. 气滞血瘀
B. 阳虚内寒
C. 寒湿凝滞
D. 湿热下注
E. 气血虚弱

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Your company has a server named Server1 that runs Windows Server 2008 R2. The Windows Server Backup feature is installed on Server1.Server1 fails. You install a new server named Server2 that runs Windows Server 2008 R2.You need to restore the companys Windows SharePoint Services (WSS) site to Server2.What should you do？（）

A. Use Wbadmin to restore the system state from backup.
B. Run Wbadmin with the Get Versions option. Install WS
C. Run Wbadmin with the Start Recovery option. Install WS
D. Use Wbadmin to restore the application and the sites from backup.

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煤气发生爆炸的三要素混合气体达到（）或（）达到着火点、密闭容器。

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