【单选题】It was _____ she was injured in the accident _____ she didn't come to the party yesterday. [ ]
【判断题】En Africa la religión principal es el animismo.
【多选题】根据参照完整性规则,若属性组F是基本关系R的外码,F与基本关系S的主码相对应,则F在R中的取值可以是( )。
【单选题】He injured his leg and ______ couldn’t play in the game.
【单选题】对全市工业企业职工的生活情况进行调查,调查对象是( )。
【判断题】La religión es un conjunto de creencias y dogmas.
【单选题】洁净车间气流组织送风、回风的不常用形式是