The variation of the desorption activation energy of dichloromethane on activated carbons was discussed hardbase ( HSAB ) princi.主要研究了金属离子改性活性炭对二 氯甲烷 脱附活化能的影响.Purpose To observe the anti - glioma effects of lymphocyte ac...
He skirted the hardest issues, concentrating on areas of possible agreement.他避开了最棘手的问题，将精力集中于有可能达成一致的领域。Many firms are concentrating on increasing their markets overseas.许多公司正在集中精力开拓它们的海外市场.The audience is all concentrat...