下面哪些协议支持可变长度子网掩码和路由聚合?()。
A.RIP v1
B.RIP v2
C.OSPF
D.VTP
参考答案:B, C
—Have we water?
—Yes, . We’d better get some.
A.run out of; we have run it out
B.run out of ; our water has run out
C.run out of; our water has been run out
D.run out; our water has run out
下列叙述正确的是()
A.纯合子测交后代都是纯合子
B.纯合子自交后代都是纯合子
C.杂合子自交后代都是杂合子
D.杂合子测交后代都是杂合子