第一级减速大齿轮
first reduction gear wheel
厂级控制
plantwide process control
plantwide control
常数级压缩
constant grade compression
长白山国家级自然保护区
changbai mountain national nature reserve
产品级三维参数化设计
product-level 3D parametric design
产品级控制结构
The construction of product layer
产品级参数化设计
product based parametric design
产品等级选择
determination to product grade