在教师表中，如果要找出职称为“教授”的教师，所采用的关系运算是（　　）。

A、投影

B、选择

C、联接

D、自然选择

Which configuration command permits dynamic detection of the ATM frame format?（）

A、aal5mux

B、aal5snap

C、aal5dynamic

D、aal5autoconfig

光（电）缆线路在（）地区无需采取相应的防护措施。

A、鼠害

B、鸟害

C、蚁害

D、蛇害

子管数量根据管孔直径及工程需要确定。数根子管的总等效外径宜不大于管孔内径的（）。

A、80%

B、85%

C、90%

D、95%

A customer plans to purchase a p5-570 that will run in SMP mode to host a large financial database on AIX 5.2.  The application is sized for an 8-way 1.65-GHz machine.  They do not currently have an existing HMC that supports p5 machines. This organization experiences unpredictable short-term spikes in processor utilization.  To mitigate the risk to their business， they are interested in IBM’s CoD offering.  In addition to the 8-way system， what else should the pSeries technical specialist recommend to the customer？（）

A、Another p5-570 building block

B、Capacity Backup p5-570 building block

C、Another p5-570 building block and at least one HMC

D、Capacity Backup p5-570 building block and at least one HMC

Examine the following command that is used to duplicate a database on the same host: RMAN> RUN { ALLOCATE AUXILIARY CHANNEL, aux 1 DEVICE TYPE DISK; DUPLICATE TARGET DATABASE TO auxdb SKIP READONLY; / } Which two statements describe the effect after the database is duplicated successfully? （）(Choose two)

The data files of the read-only tablespaces in the target database are not duplicated

The read-only tablespaces in the target database are still defined in new the database

The read-only tablespaces in the target database are changed to online after duplication

The data files of the read-only tablespaces in the target database get duplicated

The read-only tablespaces in the target database are not defined in the new database