两级

• Weakening of public administration ability in county and town and its governance
  县乡两级公共行政能力弱化及其治理
• Name two levels of government and explain how they are different
  请写出三级政府中的两级，并解释他们之间的不同点。
• Study on quantity discounts in a two - echelon supply chain for perishable goods
  易逝品两级供应链中的数量折扣问题研究
• The characters of mine - used moving ventilator with two spinning axles face to face
  矿用两级对旋轴流式通风机特点分析
• Brief discussion about the reform of the two - level management system in the university
  略论高校校院两级管理体制的改革
• Two - layer management system
  两级管理体系
• On introduction of two - step flow of communication theory into information user study
  两级传播理论在情报用户研究中的引入
• Analysis on optimal model of two supply chain based on advanced order strategy
  基于提前订购策略的两级供应链优化模型分析
• Double - reduction motor
  两级减速电动机
• Double reduction gearbox
  两级减速装置