有功

• Ac tri - phase active electric energy meter note1
  三相交流有功电能表
• Tri - phase active , reactive power simultaneous display instrument
  三相有功无功功率同时显示仪
• The quality or property of being efficient
  效能有功效的特征或性质
• The coolant helps to keep down dust and reduce the fire hazard
  冷却剂有功于降尘并减少火情。
• Intelligent three phase ac active reactive power instrument
  智能三相交流有功功率无功功率仪表
• Single phase active reactive power simultaneous display instrument
  单相有功无功功率同时显示仪
• Single phase ac active , reactive power double - channel instrument
  单相交流有功无功功率双路仪表
• Intelligent single phase ac active power reactive power instrument
  智能单相交流有功无功功率表
• A good dog deserves a good bone
  好狗应该啃好骨头,有功者受赏。
• Intelligent single phase ac active reactive power instrument
  智能单相交流有功无功功率仪表型谱表