为什么半径用r表示

页面:/news/view-2726228/ | 耗时:0.1031 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=2726228 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2726228 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2726228 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1086097,1133191,1314314,1129585,1826192,125850,2242206,1119900,522180,2031310,1088475,3206166,109629,3384896,1074630,1078821,1618824,1071759,1646306,2517101,1066442,1101629,1115400,1064527,127934,1103033,1304459,2750934,3152889,1606460) ORDER BY field (ArticleID,1086097,1133191,1314314,1129585,1826192,125850,2242206,1119900,522180,2031310,1088475,3206166,109629,3384896,1074630,1078821,1618824,1071759,1646306,2517101,1066442,1101629,1115400,1064527,127934,1103033,1304459,2750934,3152889,1606460)