Airco-Hoover sweetening

... Air-cure 空气硫化法 Airco-Hoover sweetening 爱尔柯-胡佛脱臭法 Airlift Thermo for catalytic cracking 气举催化热裂 ...

sweetening是什么意思... ... air sweetening 空气脱硫 Airco-Hoover sweetening 爱尔柯-胡佛脱硫法 copper sweetening 铜脱硫法 ...