_________(54)A.about B.aroundC.at D.from

54._________A. accurateB. modelC. preciseD. ideal

答案解析

54._________A.. exciteB. excitinglyC. excitingD.

答案解析

_________(57)A.by B.throughC.with D.from

答案解析

_________(62)A.like B.asC.for D.from

答案解析

58._________A.for B.about C.on D.from

答案解析

65._________A.as B.for C.by D.from

答案解析

设有关系模式R(A B C)和S(C D)。与SQL语句“SELECT A B D FROM R SWHERE R.C=S.C”等价的关系代数表达式为_________。

答案解析