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当采高不大时，利用顶板岩层具有的塑性弯曲能力，使之缓慢下沉，从而充满采空区并控制上覆岩层活动，称为（）。

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听说上海失业保险缴费比例下调了，是真的吗？现在上海失业保险缴费比例是多少？从什么时候开始下调的？

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社会回报率

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You are configuring five computers for Windows NT Workstation 4.0 and Windows 2000 Professional. Each computer has an 8 GB hard disk. You configure the hard disk on each computer to have two 4 GB partitions. Windows NT Workstation is installed on drive C and Windows 2000 Professional on drive D. In Windows 2000 Professional， you configure a disk quota on drive D to prevent users from saving work files on the disk. You restart your computer and load Windows NT Workstation. You notice that users can save files to drive D. You want to prevent users from saving the files to drive D in either operating system. You also want to ensure that users can access both drives while using either operating system. What should you do？（）

A. Use Windows 2000 Professional to configure drive D as a dynamic partition
B. Use Windows 2000 Professional to enable encrypting file system on drive D
C. Use Windows NT workstation to configure NTFS permissions on drive D to deny the users write permission
D. Reinstall Windows NT Workstation after configuring disk quota

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下列哪一项不属于中国法律制度特征（）。

A. 政策与道德的统一
B. 阶级性与人民性统一
C. 一国两制统一
D. 国情与公理统一

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