【简答题】根据短文内容判断正(T)误(F): Jim went to school to study history, but when he finished his first year, he didn't pass the exam and the teacher said to him, 'You have to leave school.' When the boy's father hear...
【单选题】为防止极板硫化,应按时进行(),定期进行。
【单选题】外键约束用来强制数据的_______完整性。
【单选题】流体在流动过程中,速度梯度主要存在于( )。
【简答题】表的检查约束是用来强制数据的( )完整性,表的外键约束实现的是数据的( )完整性,定义标识列的关键字是( )。
【简答题】They all finished their homework _____Jim. 除了吉姆他们都完成作业.