... standards material production license, could concoct sundry different concentrations gas mixtures, sometimes more than 20 kinds of gases. We have ... of advanced production and testing equipments used for gas mixtures gas, the gas preparation and analysis technology achieve the ... content ratio1Medicinal narcosis Gas 50%N2O+50%O22Medicinal Gas Mixtures≥99.999%N2,O2,CO2,C2H4O,Constituent content As ...