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
The process of software development doesn’t include（ ）．
A．verification function
B．writing code
C．management function
D．validation function
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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