Given： Which statement is true？（）

A、 The output could be 5-1 6-1 6-2 5-2

B、 The output could be 6-1 6-2 5-1 5-2

C、 The output could be 6-1 5-2 6-2 5-1

D、 The output could be 6-1 6-2 5-1 7-1

信息可以通过语言、声音、光等传播媒介在空间传递是指信息的可（）性。

A、普遍

B、传递

C、存储

D、识别

D40的40个分波通道插损均为5dB，不考虑噪声的影响，满波信号时，D40的IN口光功率为XdBm，如果IN口的光功率降低1dB，则其中的一个输出口的测量值为（）dBm。（假设各通道光功率均衡，lg40=1.6）。

A、(X-5)

B、(X-6)

C、(X-22)

D、(X-23)

Which of the following ALTER DISKGROUP commands does not use V$ASM_OPERATION to record thestatus of the operation?（）

A、ADD DIRECTORY

B、DROP DISK

C、RESIZE DISK

D、REBALANCE

E、ADD FAILGROUP

Examine the following RMAN command：   BACKUP DATABASE TAG TESTDB  KEEP UNTIL ’SYSDATE+1’ RESTORE POINT TESTDB06；   Which two statements are true regarding the backup taken by using the above RMAN command？（）  

 Only data files and the control file are backed up.

 Archived redo logs are backed up only if the database is open during the backup.

 The backup is deleted after one day，regardless of the default retention policy settings. 

 The backup becomes obsolete after one day，regardless of the default retention policy settings.

Examine the following scenario：   -Database is running in ARCHIVELOG mode.  -Complete consistent backup is taken every Sunday.  -On Tuesday the instance terminates abnormally because the disk on which control files are located gets corruptedThe disk having active online redo log files is also corrupted.  The hardware is repaired and the paths for online redo log files and control files are still valid.  Which option would you use to perform the recovery of database till the point of failure？（）  

A、 Restore the latest whole backup，perform complete recovery，and open the database normally 

B、 Restore the latest whole backup，perform incomplete recovery，and open the database with the  RESETLOGS option.

C、 Restore the latest backups control file，perform complete recovery，and open the database with the RESETLOGS option.

D、 Restore the latest backup control file，perform incomplete recovery using backup control file，and open the database with the RESETLOG option.