与多模光纤相比较，单模光纤具有　 ( )　 等特点
A、较高的传输率、较长的传输距离、较高的成本
B、较低的传输率、较短的传输距离、较高的成本
C、较高的传输率、较短的传输距离、较低的成本
D、较低的传输率、较长的传输距离、较低的成本

CDMA系统中使用的多路复用技术是 (1) 。我国自行研制的移动通信3G标准是(2)。
（1）A、时分多路
B、波分多路
C、码分多址
D、空分多址
（2）A、TD-SCDMA
B、WCDVA
C、CDVh2000
D、GPRS

某校园网用户无法访问外部站点210.102.58.74，管理人员可以在Windows环境下使用 ( ) 判断故障发生在校园网内还是校园网外。
A、ping 210.102.58.74
B、tracert 210.102.58.74
C、netstat 210.102.58.74
D、arp 210.102.58.74

Originally introduced by Netscape Communications, (1) are a general mechanism which HTTP Server side applications, such as CGI (2 ), can use to both store and retrieve information on the HTTP (3) side of the connection. Basically, Cookies can be used to compensate for the (4 ) nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based （5）.
（1）A、Browsers 
B、Cookies 
C、Connections 
D、Scripts
（2）A、graphics 
B、processes 
C、scripts 
D、texts
（3）A、Client 
B、Editor 
C、Creator 
D、Server
（4）A、fixed 
B、flexible 
C、stable 
D、stateless
（5）A、programs 
B、applications 
C、frameworks 
D、constrains 

 WebSQL is a SQL-like ( 1 ) language for extracting information from the web. Its capabilities for performing navigation of web ( 2 ) make it a useful tool for automating several web-related tasks that require the systematic processing of either ail the links in a (3), all the pages that can be reached from a given URL through (4) that match a ' pattern, or a combination of both. WebSQL also provides transparent access to index servers that can be queried via the Common (5) Interface.
（1）A、query 
B、transaction 
C、communication 
D、programming
（2）A、browsers 
B、servers 
C、hypertexts 
D、clients
（3）A、hypertext 
B、page 
C、protocol 
D、operation
（4）A、paths 
B、chips 
C、tools 
D、directories
（5）A、Router 
B、Device 
C、Computer 
D、Gateway