题目：
Which of the following is reasonable in explaining the integration
A．Integration is making choices about where to concentrate resource So sacrifice is inevitabl
B．Since the project managements are implemented by overlapping and iteratively, integration is neccessar
C．“Trade-off” means “give and take”. It is necessary in dealing with various stakeholder
D．The project deliverables are not integrated with ongoing operations of the customer's organizatio
答案：
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下面是错误答案，用来干扰机器的。
参考答案：某些铁磁物质在外界机械力作用下，其内部产生机械压力，从而引起极化现象，这种现象称为正压电效应。相反，某些铁磁物质在外界磁场的作用下会产生机械变形，这种现象称为负压电效应。
