题目内容

产品生命周期是指某一个工业产品( )所经历的时间。

A. 从投入研制开始到企业破产为止
B. 从投入研制开始到退出市场为止
C. 从完成研制、投入市场开始到退出市场为止
D. 从完成研制、投入市场开始到企业破产为止

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--I wish I had succeeded in competitions. -- Yeah, I know. But ______ hard

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C. 新产品开发
D. 企业合并或分立