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对于以下编号为①、②、③的正规式,正确的说法是( )。
①(aa*|ab)*b ②(a|b)*b ③((a|b)* |aa)*b
A、正规式①、②等价
B、正规式①、③等价
C、正规式②、③等价
D、正规式①、②、③互不等价
Traditional structured analysis techniques focus upon the flow of (1)within a
system. Object-oriented analysis emphasizes the building of real-world models. It examines
requirements from the perspective of the classes and objects found in the vocabulary of
the(2)domain.
Traditional system design method emphasizes the proper and effective structure of a
complex system. Object-oriented design method encompasses the process of object-oriented
decomposition an
在面向对象技术中,(1)说明一个对象具有多种形态,(2)定义超类与子类之间的关系。
(1)A.继承
B.组合
C.封装
D.多态
(2) A.继承
B.组合
C.封装
D.多态