302期:半数【《01,04,06,11,16,18,19,20,22,26,27,28,30,31,37,38,39,40,41,42,44,47,48,49》】开:22准
303期:半数【《02,05,06,07,09,11,14,21,22,23,26,29,31,33,34,35,36,38,39,45,46,47,48,49》】开:15错
304期:半数【《01,03,04,07,09,10,11,13,15,16,18,20,24,26,28,29,32,33,34,35,36,38,42,46》】开:48错
305期:半数【《01,03,04,08,15,17,18,20,21,23,26,27,30,32,33,35,37,39,40,41,43,44,47,48》】开:？？？？