1)nitrogen machine,制氮机2)JH-100 nitrogen making facilities,JH-100型制氮机3)carbon molecular sieve nitrogen production machines,碳分子筛制氮机4)Nitrogen production,制氮5)nitrogen making system,制氮系统6)Nitrogen production by membrane,膜法制氮
用法例句
Application of varying-voltage adsorption nitrogen machine in putting out fire under ground;
