| | | | | | | | | | | | | | | | | | | | | | | | | 70% - 80% ( | ) 20% - 30% | | | ； | ； | | | | | | | ； | | | | ； | | 6 | 7 4 | | 7-8 6 ； | | | | | ； | | | | |