根据我国现行宪法规定，中华人民共和国公民享有下列自由（）。
A. 言论、出版
B. 集会、结社
C. 游行、示威
D. 罢工、迁徙
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发生炉钟罩阀内放散水封的有效高度为设计压力的水柱高度加（）mm，但不得大于200mm。
A. 25
B. 50
C. 75
D. 100
反馈系统是指在闭环控制系统中，如果反馈信号与参考输入信号相加，称为正反馈控制系统。
A. 正确
B. 错误
You need to design an administrative model for Exchange Server 2003. What should you？（）
A. Create an administrative group for each office. Place each Exchange server that is managed by an office technician into that Office’s administrative group. Assign the central IT group full control over all administrative groups. Assign each office technician control over his or her office’s administrative groups
B. Create one administrative group. Place all Exchange servers in the administrative group. Assign the central IT group full control over the administrative group. Make each office technician a member fo the local Backup Operators group on each group they manage
Create an administrative group for each office. Place one Exchange server in each group. Assign the central IT group and each office technician full control over each administrative group
D. Create one administrative group for all Exchange front-end servers. Assign each office technician control over this administrative group. Create another administrative group for all Exchange back-end servers. Assign the central IT group control over this administrative grou
机场管理机构应当制定各项工作的记录，详细记录各项检查和维护情况。记录应当包括电子文件和纸质文件，电子记录应当保存（）年。
A. 五年
B. 六年
C. 十年
D. 二十年
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