百度知道 - 信息提示

Scale chemical cleaning process Divided caustic chemical descaling and pickling,Caustic washing is to different types, different concentrations of alkali injection boiler,It is then carried out under a pressure cooking stoves, so as to achieve the purpose of caustic.Pickling descaling,Acid not only can remove scale boiler heating surface, but also capable of reacting with the metal, so that the boiler has been corrosion or perforation.Therefore, pickling and technical requirements are relatively high.

Every one has hobby and my hobby is paniting . Unlike dancing and playing piano,there is no specific action and some certain rules on painting. The only thing you need to do when painting is grabing your bush and drawing on an empty paper with your imagination. Everytime i have bush, i feel i become a piece of leave , a flowing river , a floating cloud in sky , a folwer growing up on land of my country . To be honest , painting is not easy as i expected. Even there is no limitation on what you are drawing , though we need pay more attention on composition ,scope, color use and some details to make sure you can present what you are going to draw. Fortunately , i find a way to show my talent on drawing , that is decorating blackborad . I am recommended by teacher and win in several drawing competition . The most lucky thing is i know many new friends during my drawing . My dear friends , i have learned limitness happiness from drawing , i believe i can draw myself a bright future , so what are you waiting for ? Come and join me . 本人是做外贸，平时英语用的比较随意， 仅供参考，学校的题目比较注重语法 死板，中国式的英语，哎不多说 都是过来人。