171期:半数【《01,02,04,06,09,12,13,17,18,19,20,21,22,28,29,31,36,37,39,41,43,45,47,48》】开:28准
172期:半数【《01,02,03,04,05,09,10,13,14,15,16,17,18,19,26,31,33,38,39,41,42,44,45,47》】开:44准
173期:半数【《01,03,04,07,08,09,11,14,15,16,17,19,20,25,32,33,34,38,39,42,43,46,47,48》】开:26错
174期:半数【《01,02,04,06,07,08,11,12,13,14,15,20,23,24,25,26,28,29,33,36,37,44,47,48》】开:？？？？