论述我国的土地基本国策？
Your database is running in NOARCHIVELOG mode with two online redo log files. The SALES table contains sales information for the organization. The SALES table belongs to the SALESTB tablespace. On Monday， you insert 10 rows into the SALES table. The current log sequence number is 14. You change the tablespace status from READ WRITE to READ ONLY for the SALESTB tablespace. You shut down the database and take a backup of the SALESTB tablespace. On Tuesday， you start the database. You change the status for the SALESTB tablespace from READ ONLY to READ WRITE. You insert 10 more rows into the SALES table and shut down the database. The current log sequence number is 15. When you try to open the database on Wednesday morning， you discover that the SALESTB tablespace was lost because of a media failure. Which of the following options is true about recovering the SALES table？（） The SALES table cannot be recovered because the database is running in NOARCHIVELOG mode.。 The SALES table can be recovered by restoring the SALESTB tablespace from the backup and performing a media recovery.。 The SALES table can be recovered by restoring the SALESTB tablespace from the backup without performing any media recovery.。 The SALES table can be recovered by restoring the SALESTB tablespace from the backup， but the rows inserted on Tuesday need to be inserted again.。
变压器的主要发热部件是（）。 主绝缘，纵绝缘。 铁芯的线圈。 金属构件的油箱。
From SQL*Plus, you issue this SELECT statement: You use this statement to retrieve data from a data table for（）。 Updating。 Viewing。 Deleting。 Inserting。 Truncating。
倒罐的作用有（）。 保证液化石油气正常供应。 应对某个贮罐超过警界液面；。 应对某个贮罐发生泄漏；。 应对某个贮罐需要检修。
A file system has been corrupted and needs to be restored.
Which file contains the ufsdump levels for this file system？ （）
