网络系统设计包括网络拓扑结构的设计、网络主要设备的选型、系统的()、网络操作系统的选择、应用软件的()与开发等。
参考答案:结构化布线;集成
-Michael was late for Mr.Smith's oral class this morning.
- ?As far as I know,he never came late to class. [ ]
A.How come
B.So what
C.Why not
D.What for
咳嗽与咳痰的病因分类是怎样的?