【单选题】Section Four, Exercise One Qusetion 2
【单选题】Section Four, Exercise Two Qusetion 1
【单选题】Section Four, Exercise One Qusetion 4
【单选题】qusetion 16 is based on the passage you have just heard
A.
Everything seemed to be changing.
B.
They grow white flowers.
C.
They taste like apples.
D.
They come from Central Africa.
【单选题】第8到第9题基于以下的叙述:有关系模式A(C,T,H,R,S),其中各属性的含义是:属性C代表课程名,属性T代表教师姓名,属性H代表上课时间,属性R代表上课教室,属性S代表学生姓名。 根据语义有如下函数依赖集:F={ C→T,(H,R) →C,(H,T)→R, (H,S)→R}。 8.请问该关系模式A的候选码是( )
【简答题】傩 n 葜 q 猬 w 琬 wn 腱 jn 铹 l 蛱 j 牍
【单选题】Section Four, Exercise Two Qusetion 4
【单选题】qusetion 17 is based on the passage you have just heard
A.
They turned from white to purple in color.
B.
They became popular on the world market.
C.
They became an important food for humans.
D.
They began to look like modern-day carrots.