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什么是方向阻抗继电器的最大灵敏角？

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鱼类性成熟年龄大体上可分为哪几种种类型？

You work as the enterprise exchange administrator at TestKing.com. TestKing.com makes use of Microsoft Exchange Server messaging solution. The TestKing.com network consists of a single ActiveDirectory forest. The TestKing.com network contains the following： * Exchange Server 2007 Service Pack 1 （SP1） servers.* Exchange Server Service Pack 2 （SP2） servers. * Domain controllers running Windows Server 2003 Service Pack 1 （SP1）. You need to install Exchange Server 2010 to the TestKing.com network； however， you need to changes tothe existing servers for the installation of the Exchange 2010 servers. What should you do？（）

A. You should consider having the Exchange Server 2007 SP1 servers upgraded to Exchange Server 2007 SP2.
B. You should consider having the domain controllers upgraded to Windows Server 2003 （x64） SP2.
C. You should consider having the domain controllers to Windows Server 2008 （x64）.
D. You should consider having the Exchange Server 2003 servers upgraded to Eschange Server 2007 SP2.

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根据活动的人数和规模，可将课外活动分为（）

A. 科技活动、学科活动、体育活动
B. 个人活动、群众活动、小组活动
C. 参观、访问和调查
D. 报告、讲座和集会

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回采工作面上隅角瓦斯积聚的原因及处理方法有哪些？

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