【单选题】-Bad luck! It's too late. -It doesn't matter. The movie _______ for only a few minutes. You can't miss it.
【简答题】A.It can't be compressed. B.It's often polluted. C.Its temperature often fluctuates. D.It limits their size.
【简答题】创建表约束的方法有3种,第一种是在新建表时,在_________之后创建约束;第二种是在新建表时,在_________之后创建约束;第三种是表已经存在,可以通过_________添加约束。
【单选题】— He’s often seen to help others, ? — . He’s helpful. We all like him.
【单选题】What damage had Washington caused?
A.
There's been a 60 percent drop in the number of researchers.
B.
Washington has created an atmosphere of suspicion.
C.
Promising young scientists are leaving for university.
【多选题】传统营销的促销形式主要有四种:广告、销售促进、宣推销。网络营销是在网上市场开展的促销活动,相应形式也有4种,以下选项属于网络促销活动的是()。
【简答题】创建表约束的方法有3种:第一种是在新建表时,在_________之后创建约束;第2种是在新建表时,在______之后创建约束;第3种是表已经存在,可以通过________添加约束。