在均匀电场及稍不均匀电场中，设置屏障（）提高气体间隙的击穿电压. 不能。 能。 能显著。
You discover an out-of-space condition in the database. You decide to suspend a session for five minutes. You issue the following command to suspend the session： ALTER SESSION ENABLE RESUMABLE； Which command could you issue to enable the resumable space allocation feature at the session level？（） ALTER SESSION ENABLE RESUMABLE_TIMEOUT = 5；。 ALTER SYSTEM ENABLE RESUMABLE_TIMEOUT = 5；。 ALTER SESSION ENABLE RESUMABLE_TIMEOUT = 300；。 ALTER SYSTEM ENABLE RESUMABLE TIMEOUT = 300；。
幼儿园规章制度的类型主要有（） 全国性制度。 部门性制度。 各类人员岗位责任制。 幼儿园考核与奖惩制度。
Which view shows all valid values for the NLS_LANGUAGE, NLS_SORT, NLS_TERRITORY,and NLS_CHARACTERSET parameters?（） V$VALID_NLS_VALUES。 NLS_VALID_VALUES。 NLS_VALUE_OPTIONS。 V$NLS_VALUE_OPTIONS。 V$NLS_VALID_VALUES。
You perform differential incremental level 1 backups of your database on each working day and level 0 backupon Sundays， to tape. Which two statements are true about differential incremental backups（） The backup performed on Sundays contains all the blocks that have ever been used in the database.。 The backup performed on Sundays contains all the blocks that have changed since the last level 1 backup.。 The backup performed on each working day contains all the blocks that have changed since the last level 0 backup.。 The backup performed on Monday contains all the blocks that have changed since the level 0 backup， and every other working day contains all the blocks that have changed since the level 1 backu。
A system has a mirrored data volume group that has a filesystem /data of 10 logical partitions. How many physical partitions will the filesystem have？（）
