永磁直流伺服电动机的工作曲线分为三个区域，其中Ⅱ区为()。

A. MD5

B. DES

C. Kerberos

D. unauthenticated

E. simple password

A．ping

B． FTP

C． Telnet

D． HTTP

E． HTTPS

A. Authentication enforcer

B. Directory server

C. Captive authentication

D. Authentication policy

E. Role-mapping rules

A．NCP

B． LCP

C． ISDN

D． DLCI

E． SLIP

A．A

B．B

C．C

D．D

E．E

A. OSPF area ID

B. OSPF neighbor address

C. OSPF loopback address

D. OSPF authentication type

A.hostname

B.static route

C.virtual router

D.loopback reference

A. IS - IS is more CPU - intensive than is OSPF

B. For greater fine tuning there are more IS - IS timers

C. IS - IS LSP con tains TLV fields and OSPF LSU contains the LSAs

D. New additions to the protocol are easily implemented in OSPF but not with IS - IS

E. OSPF has more area types than does IS - IS

A. all routers on a link

B. all routers in an area

C. all external OSPF peers

D. all routers in an OSPF domain