牵牛子不宜与下列何药配伍（） A.芒硝 B.五灵脂 C.硫黄 D.巴豆 E.郁金

若关系模式R∈1NF，且每一个非主属性完全函数依赖于码，则R∈()。

A．1NF

B．2NF

C．3NF

D．BCNF

与乳剂形成条件无关的是

A、降低两相液体的表面张力

B、形成牢固的乳化膜

C、确定形成乳剂的类型

D、有适当的相比

E、加入反絮凝剂

Green vegetables are ____your health.  [ ]

A. well for    

B. good for  

C. well in    

D. good at

移动通信公司采用的GPRS是（）的技术之一。

A.第1代移动通信系统

B.第2代移动通信系统

C.第2.5代移动通信系统

D.第3代移动通信系统

The police were trying to _____ where the drug dealers were _____ it suddenly dawned upon them

that they might be hidden somewhere 10 miles within the border between the two countries. [ ]

A. come out; when  

B. make out; while  

C. figure out; when  

D. think out; since