在单总线结构的CPU中，连接在总线上的多个部件（）。
A、某一时刻只有一个可以向总线发送数据，并且只有一个可以从总线接收数据
B、某一时刻只有一个可以向总线发送数据，但可以有多个同时从总线接收数据
C、可以有多个同时向总线发送数据，并且可以有多个同时从总线接收数据
D、可以有多个同时向总线发送数据，但可以有一个同时从总线接收数据
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.
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？（）
AOnly data files and the control file are backed up.
BArchived redo logs are backed up only if the database is open during the backup.
CThe backup is deleted after one day，regardless of the default retention policy settings.
DThe backup becomes obsolete after one day，regardless of the default retention policy settings.
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)
不能将选定的内容复制到剪贴板的操作是（）。
A、CTRL+B
B、CTRL+C
C、CTRL+X
D、“编辑”菜单中选“剪切”