“联合制”用英语怎么说？

目前主要用联合制碱法生产碳酸钙纯碱.At present mainly uses the union system alkaline process production calcium carbonate soda ash.它的工业制法主要有氨碱法和联合制碱法两种.Its industry facture mainly has the ammonia soda law and the system alkaline process t...