单项选择题

A well-designed system should be ______.
①easily understood
②reliable
③straightforward to implement
④straightforward to maintain

A．①②
B．①③④
C．②③④
D．①②③④
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单项选择题
Each box is an activity; the number it contains is the duration of the activity in days. The duration of the critical path is ______.
单项选择题
Consumption of the total life-cycle effort in software maintenance is ______ that in software development.
A．less than
B．larger than
C．equal Or less than
D．equal or larger than
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