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聚丙烯腈多采用湿法纺丝，其典型凝固浴为的（）的水溶液。

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You work as the exchange administrator at TestKing.com. The TestKing.com network contains an Exchange Server 2010 Organization. The organization consists of 40 servers is configured to run Exchange Server 2010. A new TestKing.com security policy requires that approved server patches of Exchange and Windows aswell as security updates be applied to servers within seven days of it being released. During the course of day you receive an instruction from management to： * Ensure that only approved patches and security updates are installed. * Ensure that only administrators are allowed to approve patches and security updates manually. * Ensure that the deployment casts is reduced. * Ensure that the administrative effort of deploying patched is reduced. You are instructed to recommend a solution that will comply with the set criteria. What should you do？（）

A. You should recommend that Microsoft System Center Configuration Manager be included in your solution.
B. You should recommend that Windows Update be included in your solution.
C. You should recommend that Windows Server Update Services be included in your solution.
D. You should recommend that Microsoft Update be included in your solution.

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在某一产量水平上，某一厂商的平均成本达到了最小值，这意味着（）。

A. 边际成本等于平均成本；
B. 厂商获得了最大利润；
C. 厂商获得了最小利润；
D. 厂商的经济利润为零。

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生产实践中，通常在同纬度、同海拔地区之间进行水稻引种容易成功。

A. 正确
B. 错误

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《济南铁路局站内平过道管理办法》（济铁运函[2007]243号）对车站值班员通知平过道监护员有何要求？（设有平过道的车站学习）

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