短语词组短语Mild hydrocracking catalyst 温和加氢裂化催化剂MHCU Mild Hydrocracking Unit 缓和加氢裂化MHC Mild hydrocracking 缓和加氢裂化mild hydrocracking process 缓和加氢裂化过程MHC Mild Hydrocracking Unit 温和的加氢裂化装置 返回 mild hydrocracking