为确保合金钢管道焊口管道内壁焊肉饱满、光滑、平整，焊缝底层应采用( )。
A．手工氩弧焊
B．手工电弧焊
C．CO2埋弧焊
D．氧—乙炔焊
参考答案：A
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 all 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.
（5）处填（）。
A．Router
B．Device
C．Computer
D．Gateway
哪种保健功能卫生部不受理和批准（ ）。
A．抗疲劳
B．辅助抑制肿瘤，防癌
C．减肥
D．调节血脂
