Wed, 13 Dec 2006 13:13:00 GMThttp://blog.csdn.net/zxy19821020/http://blog.csdn.net/zxy19821020/archive/2006/12/13/1441246.aspxhttp://blog.csdn.net/zxy19821020/comments/1441246.aspx0http://blog.csdn.net/zxy19821020/comments/commentRss/1441246.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=1441246凯哥你好<img src ="http://blog.csdn.net/zxy19821020/aggbug/1441246.aspx" width = "1" height = "1" />Wed, 13 Dec 2006 21:13:00 +0800zxy19821020http://blog.csdn.net/zxy19821020/archive/2006/12/13/1441246.aspx#Feedbackhttp://blog.csdn.net/zxy19821020/archive/2006/12/13/1441246.aspxzxy19821020http://blog.csdn.net/zxy19821020/archive/2006/07/01/861150.aspxhttp://blog.csdn.net/zxy19821020/comments/861150.aspx0http://blog.csdn.net/zxy19821020/comments/commentRss/861150.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=8611501. A database management system (DBMS) 2.Relational DBMS 3.Multidimensional DBMS 4.Description<img src ="http://blog.csdn.net/zxy19821020/aggbug/861150.aspx" width = "1" height = "1" />Sat, 01 Jul 2006 22:08:00 +0800zxy19821020http://blog.csdn.net/zxy19821020/archive/2006/07/01/861150.aspx#Feedbackhttp://blog.csdn.net/zxy19821020/archive/2006/07/01/861150.aspxzxy19821020http://blog.csdn.net/zxy19821020/archive/2006/07/01/860286.aspxhttp://blog.csdn.net/zxy19821020/comments/860286.aspx0http://blog.csdn.net/zxy19821020/comments/commentRss/860286.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=860286Cables link local terminals directly to a computer system. Remote terminals communicate with a computer over data transmission lines. Data are stored as discrete pulses inside a computer, but often must be converted to analog form for transmission over communication lines. Converting pulses to wave form is called modulation; converting back is called demodulation; the device that performs this function is a modem. Perhaps the best-known data communication medium is the telephone netwo<img src ="http://blog.csdn.net/zxy19821020/aggbug/860286.aspx" width = "1" height = "1" />Sat, 01 Jul 2006 18:42:00 +0800zxy19821020http://blog.csdn.net/zxy19821020/archive/2006/07/01/860286.aspx#Feedbackhttp://blog.csdn.net/zxy19821020/archive/2006/07/01/860286.aspxzxy19821020