310期半数<<03,04,05,09,10,11,13,14,18,19,22,23,24,25,27,29,30,31,33,34,35,36,37,38,41,43,48,49>>】开37准
311期半数<<02,05,08,09,11,12,13,15,16,18,20,21,23,24,26,27,28,30,34,35,36,38,39,41,43,47,48,49>>】开40错
312期半数<<01,02,05,06,09,11,13,17,18,20,21,22,23,25,26,27,28,29,30,33,36,37,40,42,44,45,47,49>>】开？？