系统开发的指导原则有（）。
A.系统开发的目的性
B.系统的环境适应性
C.系统开发的规范性
D.用户参与
E.文档化管理
参考答案：A, B, D, E
Which of the following statements about object oriented databse is not correct
A． Each object has a unique object identity in the system.
B． Encapsulation and inheritance are two important features of object oriented database.
C． A subclass can inherit the attributes and methods of all its superclasses.
D． A subclass includes the attributes and methods of all its subclasses.
既能震惊，有能解毒的药物是 （ ）
A．朱砂
B．磁石
C．龙骨
D．琥珀
E．远志
