长期使用产品安全标示制度
long-term use product safety marking system
长期使用产品安全检修制度
Long-term Use Product Safety Inspection System
产品产量的优化组合
Optimization combination of product quantity
产品级参数化设计
product based parametric design
产品级控制结构
The construction of product layer
产品级三维参数化设计
product-level 3D parametric design
产品品类选择准则
Product class’s choice criteria
产品品牌差异
product brand differentiation