WebSQL is a SQL-like (6) language for extracting information from the web. Its capabilities for performing navigation of web (7) makes it a useful tool for automating several web-related tasks that require the systematic processing of either all the links in a (8) , all the pages that can be reached from a given URL through (9) that match a pattern, or a combination of both. WebSQL also provides transparent access to index servers that can be queried via the Common (10) Interface.

A．query

B．transaction

C．communication

D．programming

水处理构筑物的高程布置的原则有______。

A．应充分利用原有地形坡度，减少施工的土方量

B．在水处理工艺流程中，各构筑物之间水流应为重力流

C．各处理构筑物的连接管的允许流速应满足相关要求

D．在水处理工艺流程中，各构筑物之间水流应为压力流