| | | 3 | | | | 3 1 | 3 2 | | | | | | | ( ) 3 1 | | ( ) | | | | | | ( ) | | | | | | | | 3 15 | | | | | | | | | | | | | | | | 3 1 | | | | | | | | | | | 3 | 1 | | | | ； 1 3 | | ； | | ； | | | | | 3 1 | | | | | | | | | 3 | 1 | | | | | | | | | 3 1 | | | | | | | ； | | | | | | | 3 13 | | | 30 | 180 90 ) | | | |