单项选择题

In HDLC protocol, when supervisory frame's type code is '00'. About the following state-ments, which is correct ( )

A．receive ready
B．receive not ready
C．reject
D．selective reject
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单项选择题
There are several periods in a computer, the longest period is ( ).
A．instruction period
B．machine period
C．beat period
D．CPU period
单项选择题
软件设计将涉及软件的结构、过程和模块的设计，其中软件过程是指( )。
A．软件开发过程
B．模块的操作细节
C．软件层次结构
D．模块间的关系
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