在广播或者N错M对网络中，DR和DROther建立邻接关系，错DR也和DROther建立邻接关系，DR和错DR之间不需要建立邻接关系（）

A．true

B．false

A．224.0.0.5

B．224.0.0.6

C．224.0.0.55

D．224.0.0.66

A、full

B、双向

C、loading

D、established

A.网段中的DR一定是priority最大的路由器。

B.在广播和NBMA以及point-to-muiltipoint类型的接口上才会选举DR

C.DR是指某个网段中概念，是针对路由器的接口而言的。某台路由器在一个接口上可能是DR，在另一个接口上可能是BDR，或者是DROther。

D.两台DROther路由器之间不进行路由信息的交换，也不会互相发送HELLO报文。

A、DR

B、DR other

C、所有运行OSPF的路由器

D、所有OSPF邻居

A．true

B．false

Themajor difference between Dr. Vink and other geneticists is that [ A ] her research is not based on thestudy of twins but on questionnaires. [ B] her research does not emphasize thecontrast between two kinds of twins. [ C ] her research is interested inthe-smoking habits of fraternal twins. [ D ] her research only focuses on thestudy of the DNA of adult twins.