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什么是第三方物流？第三方物流在我国有哪些主要运作模式？

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用半晶干涉法测量小平面的平面度，这种测量方法符合（）。

A. 最小条件
B. 包容原则
C. 相关原则

You are a professional level SQL Sever 2008 Database Administrator in an international corporation named Wiikigo. You are experienced in managing databases in an enterprise-level organization, optimizing and sustaining the database life cycle. In the company, your job is to implement solutions on security, troubleshooting, deployment and optimization. A SQL Server 2008 infrastructure is managed by you. There are 30 branch offices in DoubleSecurity Insurance, and in the branch offices, customer data are stored in SQL Server 2008 databases. Customer data should be security compliant if it is stored through multiple database instances. You intend to utilize the Policy-Based Management feature to design a strategy for custom policies. And the format of custom policies is XML format. The requirements listed below should be satisfied. The company distributes custom policies to all instances. In addition, the company enforces the policies on all instances. A strategy should be thought out and the minimum amount of administrative effort should be utilized. Which action should you perform to finish the task?（）

A. To finish the task, the Distributed File System Replication service should be utilized.
B. To finish the task, a configuration server should be utilized.
C. To finish the task, the policies should be distributed by utilizing Group Policy Objects.
D. To finish the task, the policies should be distributed by utilizing the Active Directory directory service.

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结合实例，试分析我国社会福利服务体系的问题，并提出改革建议。

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给水管网架空管道应设置固定支架或防晃支架。配水干管及配水管，配水支管每（）m长度内应至少设一个防晃支架。

A. 10
B. 15
C. 20
D. 25

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