Khí hiệu chuẩn CO:25.5% CH4:0.55% H2:18% CO2:5.5% N2:49% balance Argon

Khí hiệu chuẩn CO:25.5% CH4:0.55% H2:18% CO2:5.5% N2:49% balance Argon Tên sản phẩm: Khí hiệu chuẩn CO:25.5% CH4:0.55% H2:18% CO2:5.5% N2:49% balance Argon Thể tích: 10L, 20L, 40L Dung sai /...