One of the tablespaces is read-only in your database. The loss of all control files forced you to re-create the control file. Which operation do you need to perform after re-creating the control file and opening the database？（） drop and re-create the read-only tablespaces。 rename the read-only data files to their correct file names。 change the tablespace status from read/write to read-only。 re-create the read-only tablespace because it is automatically removed。
简述上市股票及其评估方法？
Bandwidth limits cannot be：（） per （LDAP） group。 per user。 overall。
Which is not a reason that Internet Service Providers prefer to use PPP over Ethernet (PPoE)?（） access control and billing can be done on a per-user, rather than a per-site basis。 supports Link Fragmentation and Interleaving 。 provides the ability to connect a network of hosts over a simple bridging access device。 provides a consistent means of authenticating users (RADIUS for example)。
在动态建模机制中，一消息来完成对象之间的交互，用（）来描述系统的行为。 状态图和顺序图。 协作图和活动图。 数据流图和实体关系图。 对象图和包图。
Which service component in a detailed design development focuses on identification and configuration of the actual network components （routers， servers， local-area networks， and so on） to be incorporated to run and support a Cisco Unified Communications system. （）
