A.正向查找区域B.反向查找区域C.前向查找区域D.后向查找区域
A.114.114.114.114 B.180.76.76.76 C.223.5.5.5 D.223.6.6.6
A.112.112.112.112 B.114.114.114.114 C.8.8.8.8 D.8.8.4.4