最后，从开发模式和旅游线路设计方面进行产品组合的深度开发。
At last , developed models and tourism routes are designed .
产品策略方面，提出加强中档产品组合深度、研发设计区域性产品和扩充工程产品线的策略。
In the product strategy , put forward to increase product variety of mid-range products and engineering products .
产品组合深度