1. A soft iron rod in a coil or transformer that provides a path for and intensifies the magnetic field produced by the windings. 
   铁心包在线圈内或变压器中的柔软铁条，用于提供道路和加强由线圈曲转产生的磁场
2. economic operation of transformer 
   变压器经济运行
3. inrush current of transformer 
   变压器涌流
4. Do you enjoy transformer? 
   你喜欢变形金刚？
5. voltage regulating devices of transformer 
   变压器调压装置

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• 1. 变压器线圈缠绕用纸
  transformer board 变压器用纸板...transformer coil winding paper 变压器线圈缠绕用纸...transformer coil 变压器线圈
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