“Consumers shop in ways that can be predicted by such determinants as income level, sex, and age;consequently, producers use market research that aims to identify different target groups for their pro

解析: 【解析题】具备下列条件的民事法律行为有效( ) 【解析题】篆、隶、楷、行、草的产生、发展、成熟、完善及Read More