题目：The prevailing distributed computing model of the current era is called client/server computing. A （1） is a solution in which the presentation,presentation logic,application logic,data manipulation and data layers are distributed between client PCs and one or more servers. A （2） is a personal computer that does not have to be very powerful in terms of processor speed and memory because it only presents the interface to the user. A （3） is a personal computer,notebook computer,or workstation that is typically more powerful in terms of processor speed,memory,and storage capacity. A （4） hosts one or more shared database but also executes all database commands and services for information systems. A （n）（5） hosts Internet or intranet Web sites,it communicates with clients by returning to them documents and data.
