bostonsCOCA¹⁰⁴²⁶⁸BNC¹²⁶⁴¹⁶⁺⁴ 基本例句 🌏波士顿舞原型boston的复数 The theories of the product composition, life cycle and Bostons matrix are followed. Theory study and investigate study are adopted and quantitative analysis is combined with qualitative analysis. 本文遵循产品组合理论、产品生命周期理论及波士顿矩阵理论，采用了理论联系实际、定量分析与定性分析相结合的方法。 cnki