v.預(yù)熱
The processes of preheating and welding of super scale penstocks were detailed. 本文詳細(xì)敘述了巨型壓力鋼管的預(yù)熱裝配和焊接過程。
Condensate from the first-effect calandria is used for preheating the feed. 一效列管換熱器中出來的冷凝液被用來預(yù)熱進(jìn)料。