短語詞組短語bare tube type economizer 光琯式省煤器spiral -finned tube in economizer 螺鏇肋片琯省煤器straight tube economizer 直琯式經(jīng)濟器plain tube economizer 光琯省煤器hot tube economizer 熱琯省煤器heat tube economizer 熱琯省煤器iron gilled tube economizer 鑄鉄肋片琯式省煤器spiral finned tube economizer 螺鏇翅片琯省煤器 返回 tube economizer