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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Tool for defining activities is ______.

A. Dependency Determination
B. Precedence Diagramming method
C. Rolling Wave Planning

D. Schedule network Templates

单项选择题（20）是（）

A. signature
B. mark
C. stamp
D. hypertext