convection preheater的用法和樣例：
例句
- The filament drive included a trailing weight and a preheater.
長(cháng)絲體的傳動(dòng)部分包括一個(gè)拖拉重錘和一個(gè)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(guò)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(shù)措施。
