单项选择题

判定表和判定树是数据流图中用以描述加工的工具，它常描述的对象是( )。

A．操作条目
B．层次分解
C．逻辑判断
D．组合条件
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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
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
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