单项选择题

LANs can be connected by using bridges, which operate in the

A．physical layer
B．data link layer
C．network layer
D．transport layer
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单项选择题
软件测试的白箱测试是对软件的结构进行测试，下述 Ⅰ．边缘值分析 Ⅱ．语句测试 Ⅲ．分支测试 Ⅳ．路径测试 是白箱测试的是
A．Ⅰ
B．Ⅱ和Ⅲ
C．Ⅲ和Ⅳ
D．Ⅱ、Ⅲ和Ⅳ
单项选择题
Which of the following statements about object oriented database is not correct
A．Each object has a unique object identity in the syste
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 superclass includes the attributes and methods of all its subclasses
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