通过PC机键盘输入汉字时，需要经过多次代码转换(下图是代码转换过程的示意图)。上图中①、②、③分别是

A．user@router&

B． user@router#

C． user@router%

D． user@router>

A.show ip ospf

B.show ip route

C.show ip protocols

D.show ip ospf database

E.None of the other alternatives apply

A. show interfaces terse

B. show interfaces extensive

C. monitor interface traffic

D. monitor traffic interface

splayed below:After considering the effects of the command output illustrated in the exhibit above,which of the following protocols are operational on the serial link？（）

A. PPP

B. IP

C. Compression

D. IPX

E. Multilink

F. ATX

A. point-in-time recovery

B. execute the ROLLBACK command with transaction number

C. flashback the database to before the transaction was committed

D. determine all the necessary undo SQL statements from FLASHBACK_TRANSACTION_QUERY and use them for recovery

A. Show module

B. Show errdisable detect

C. Show environment

D. Show diagnostic content

A．A

B．B

C．C

D．D

Which word would you use to describe the author's tone in this passage？

A．Supportive.

B．Objective.

C．Critical.

D．Indifferent.

A．put

B． set

C． show

D． get