重点两定位 20 组稳中: 包 7 千位或7百位,{铁76。}
(1)包重点范围 10 组:百位与个位合49
(2)三字现:017,172,173,671,132,137,138,139
(3)二字定位:22××,27××,2××6,2××7,62××,67××,6××6,6××7,72××, 77××,7××6,7××7,12××,17××,1××7,1××6
(4)三字定位:22×6,27×6,2××6,23×7,62×7,67×6,68×6,68×7