塞柄的内旁通一般用于（） 压力平衡。 排放管线内压力。 连接塞柄结合器。 排放被切管压力。
Given： foo and bar are public references available to many other threads. foo refers to a Thread and bar is anObject. The thread foo is currently executing bar.wait（）. From another thread，what provides the most reliable wayto ensure that foo will stop executing wait（）？ foo.notify（）；。 bar.notify（）；。 foo.notifyAll（）；。 Thread.notify（）；。 bar.notifyAll（）；。
The system analysts have requested heavy use of object features. The database design makes use of PL/SQL8 object types, methods, and LOB types. How do you work with these features on the client?（） Write client-side subprograms containing the PL/SQL8 constructs, and move them into an object group. 。 Write server-side subprograms, and call the subprograms from the form application. 。 Store the PL/SQL8 constructs in a PL/SQL library, and attack the library to each form muddle in your application.。
In your database， all the tablespaces are locally managed. You started Recovery Manager （RMAN） using recovery catalog and restored the control file by using the following command： RMAN> RESTORE CONTROLFILE； Which two operations do you need to perform after restoring the control file from backup？（） shut down and restart the instance。 add new tempfiles to the temporary tablespaces after recovery。 perform a media recovery and open the database with the RESETLOGS option。 perform a media recovery and bring the database to NOARCHIVELOG mode。
机电传动系统中如果TM 加速。 匀速。 减速。 停止。
下列关于分封制的论述不正确的是（）。
