nitrogenize वाक्य

उदाहरण वाक्य

1. 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