问题
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
答案
参考答案：D
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A well-designed system should be ______.
①easily understood
②reliable
③straightforward to implement
④straightforward to maintain
A．①②
B．①③④
C．②③④
D．①②③④
参考答案：D