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问题 多项选择题

（）情况的客票，严禁办理退票。

A.超过客票有效期的客票

B.各类协议免票、金鹿卡（BBB）免票

C.不完整的客票

D.票价、航段、舱位进行了删改处理的客票

答案

参考答案：A, B, C, D

单项选择题

（71） analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the（72）for designing and constructing an improved system. （73） is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called（74） . （75） is another such technique that integrates data and processConcerns into constructs called objects.

A．PERT

B．DFD

C．ERD

D．UML
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填空题

犯罪预防的措施有（）、（）
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