The screw and barrel of extruder are made of high quality 38crmoala allay steel , the hardness is over hv950 after nitrogenizing treatment
2.
It was suggested that the urban sewage of shanghai city be de - nitrogenized and de - phosphorusized before releasing in order to control the occurrence of red tide
परिभाषा
treat with nitrogen or a nitrogen compound पर्याय: nitrify, nitrogenise,
मोबाइल