“天行有常”中“常”是什么意思？
带式制动器背衬垫钢带的端部与固定部分的连接，应采用（） 铰接。 螺栓连接。 铆接。
You recently upgraded all Windows NT Workstation 4.0 computers to Windows 2000 Professional. You want to give a new employee named Maria the ability to back up files, share resources, and install programs on a client computer that she shares with other users. You do not want Maria to be able to read other users' files. What should you do to accomplish these goals?（） Add Maria’s user account to the System group.。 Add Maria’s user account to the Interactive group.。 Add Maria’s user account to the Power Users group.。 Add Maria’s user account to the Administrators group.。 Add Maria’s user account to the Backup Operators group.。
Which command is required to apply an access list on a virtual terminal line of a router?（） Router(config-line)# access-class 10 in。 Router(config-if)# ip access-class 23 out。 Router(config-line)# access-group 15 out。 Router(config-if)# ip access-group 110 in。 Router(config-line)# access-list 150 in。 Router(config-if)# ip access-list 128 out。
试论广告受众与消费者的关系？
旅客申请下列哪一种变更，铁路不予办理。（）
