母体方差差异性
Variance difference of a population
市场营销活动高效性
Marketing activities efficiency
心理性市场区隔
Psychographic market segmentation
电力企业的市场营销
Marketing of electric power enterprises
电力市场营销策略
Marketing tactic for electric power market
电力市场营销策略实施
Implementation of power marketing strategy
服务市场营销
Marketing in service market