美国经济学家弗农认为许多新产品的生命周期经历的三个阶段为()
A.产品研制阶段
B.产品创新阶段
C.产品成熟阶段
D.产品标准化阶段
E.产品退出市场阶段
正确答案是BCD
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Passage 3 Questions 11 to 15 are based on the following passage The City of Melton has been awarded the UNESCO(联合国教科文组织) Learning City Award at UNESCO's 2nd International Conference on Learning Cit