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进行毒理学试验，在选择试验动物时，一般应遵循怎样的原则？

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下列土地的使用者不可以依法取得划拨国有土地使用权的是（）。

A. 国家机关用地和军事用地
B. 城市基础设施用地和公益事业用地
C. 国家重点扶持的能源、交通、水利等项目用地
D. 乡村集体办公用地

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下列选项中，属于钢琴协奏曲作品的是（）

A. 《梁祝》
B. 《春江花月夜》
C. 《黄河》
D. 《长江随想曲》

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有关多媒体技术交互性的特征说法不正确的是（）。

A. 提供了人机沟通的渠道
B. 不提供接收方对媒体信息的编辑和控制
C. 用户可以按照自己的意愿去选择信息内容
D. 用户可以有效地控制和使用信息

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TestKing.com has employed you as their Exchange Administrator. The TestKing.com network contains anExchange Server 2010 Organization. You are responsible for managing the Exchange network forTestKing.com. A TestKing.com policy pertaining to users who no longer works for the company indicates that their useraccounts needs to be disabled and their mailboxes be removed after four months. Any messages in themailboxes have to be kept for a period of two years. You are instructed to recommend a solution that willretain the e-mail messages of employees who leave the company. Your solution needs to meet therequirements below： * The process is managed by a group named HR5 * The disk space needed to store the mailbox database should be reduced. What should you do？（）

A. Your best option would be to assign HR5 the Mailbox Search management role.Thereafter a managed folder mailbox policy should be created.
B. Your best option would be to assign HR5 the Mailbox Import Export management role.Thereafter Personal Archives should be configured for every mailbox.
C. Your best option would be to assign HR5 the Mailbox Import Export management role.Thereafter HR5 should be instructed to export mailboxes to personal folder （.pst） files.
D. Your best option would be to assign HR5 the Mailbox Search management role.Thereafter a retention policy should be created.

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