变压器产品
power transformer products
产品产量的优化组合
Optimization combination of product quantity
产品品类选择准则
Product class’s choice criteria
产品品牌差异
product brand differentiation
产品品质及经济效益
quality and economical benefit of a product
电器产品测试
test of the electric appliances product
电器产品认证
electrical appliance certification