VLAN概念的引入，使交换机承担了网络的分段工作，而不再使用（）来完成。
A.路由器
B.集线器
C.网桥
D.交换机
参考答案：A
Daniel blue and yellow sports clothes, and he smart and modem in the clothes. [ ]
A. wearing; looking
B. is wearing; is looking
C. is wearing; looks
D. wears; is looking
只有当人口增长快于GNP的增长时，才能达到人均GNP的增长
