n.預熱器
The filament drive included a trailing weight and a preheater. 長絲體的傳動部分包括一個拖拉重錘和一個預熱器。
By analyzing the failure cause of boiler air preheater, the measure of preventing it from failure was discussed. 摘要通過對鍋爐空氣預熱器失效原因的分析，提出了一些防止空氣預熱器失效的技術措施。
