关系模式规范化需要考虑数据间的依赖关系，人们已经提出了多种类型的数据依赖，其中最重要的是函数依赖和______。
参考答案：多值依赖
阅读短文，判断下列句子正(T)误(F)。
Hello, my name is Bill. I have a sister. Her name is Lily. She is a nice girl. There is a yellow flower
on her head. Lily has a doll. Look! My train is on the floor. It is very long. I put Lily's doll on the train.
Lily smiles, and I smile, too. We are happy.
( )1. Bill has a sister.
( )2. There is a red flower on Lily's head.
( )3. Bill has a doll.
( )4. The train is very short.
( )5. Bill puts the doll on the train.
溴己新的药理作用包括
A．裂解粘痰中的粘蛋白
B．不能抑制粘多糖合成
C．间接镇咳作用
D．使痰液变稀
E．增加呼吸道分泌
