短语词组短语bare -tube wall 光管水冷壁stainless steel bare tube 不锈钢光管bare tube wall 光管管壁Bare Tube Economizer 光管式省煤器bare tube type economizer 光管式省煤器bare tube furnace 光管水冷壁炉膛bare tube transfer area 裸管换热面积 返回 bare tube