Through to introduce equipments of vertical shaft the cautery ,compendiary introduce insufficiency of electricity-arc spray-paint to prevent cauterization.
The perservative in liquid beverage was extrcated with n-hexane.The hexane layer was subjected to cyclodextrine polymer resin colume.The colume was eluted with aqueous solution of ethanol.
The corrosion mechanism of sulphureous sewage was analyzed. The process condition for corrosion-proof construction was recommended. The safe operation measure of sulphureous sewage tank was proposed.