【单选题】关系模型中,一个关键字
C.
可由一个或多个其值能唯一标识该关系模式或任何元组的属性组成
【单选题】关系模型中,一个关键字
C.
可由一个或多个其值能唯一标识该关系模式或任何元组的属性组成
【简答题】A mother and her young son get into a bus in a small city and sit down. The bus conductor comes to them for their money. The mother says: “I want one ticket(票)to the zoo ” and gives him one yuan. The ...
【简答题】A mother and her young son get into a bus in a small city and sit down. The bus conductor comes to them for their money. The mother says: “I want one ticket____to the zoo ” and gives him one yuan. The...
【单选题】下列Internet应用中对实时件要求最高的是( )。
【单选题】'I'm going to Woodford Green,' I said to the conductor as I got the bus, 'but I don't know where it is.' 'I'll tell you where to get .' answered the conductor.
【单选题】下列哪一种细胞能合成分泌免疫球蛋白(Ig)
【单选题】下列Internet应用中对实时性要求最高的是(57)。
【单选题】下列Internet应用中对实时性要求最高的是______。
【单选题】下列Internet应用中对实时性要求最高的是()。