WebSQL is a SQL-like ___(71)___ language for extracting information from the web. Its capabilities for performing navigation of web ___(72)___ make it a useful tool for automating several web-related tasks that require the systematic processing of either all the links in a ___(73)___ , all the pages that can be reached from a given URL through ___(74)___ that match a pattern, or a combination of both. WebSQL also provides transparent access to index servers that can be queried via the Common ___(75)___ Interface.

A．Router　　　

B．Device　

C．Computer　

D．Gateway

某管沟工程，设计管底垫层宽度为2000㎜，开挖深度为2.00米，管径为1200㎜，工作面宽为400㎜，管道中心线长180米，管沟土方工程量计算正确的是（）

A.432立

B.576立

C.720立

D.1008立