双级

• Top mounted double reducton final drive
  上置式双级主减速器
• Two speed double reduction final drive
  双级双速主减速器
• Two - stage compression cycle for water heaters in air source heat pumps
  空气源热泵热水器双级压缩循环研究
• Dual staged cross connect architecture
  双级交叉连接结构
• Insulated gate bipolar transistor
  绝缘的双级晶体管
• Development and application of dual - stage and high efficiency setting connector
  双级高效坐封连通器的研制及应用
• Double reduction final drive
  双级主减速器
• Compound two stage ammonia screw compressor unit in rapid freezing refrigeartion system
  速冻用单机双级氨螺杆制冷压缩机组
• Two step injection sysyem
  双级喷射系统
• Double stage compressor
  双级压气机