在分层结构中,DFD定义了三个层次类别的DFD图:()、0层图和N层图。
A.1层图
B.底层图
C.上下文图
D.顶视图
参考答案:C
治病时考虑年龄的治则是( )
A.因人制宜B.因时制宜C.因地制宜D.治未病E.扶助正气
John's long service with the company was ______ a present from the CEO.
A.confirmed by
B.recorded with
C.appreciated by
D.acknowledged with