什么是抛物线的焦点

页面:/news/view-497914/ | 耗时:0.0655 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=497914 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=497914 LIMIT 0,1
select * from tbl_Articles_sphinx where id=497914 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1103390,364122,3418318,1112832,1119281,1083445,714982,1083195,1114148,417730,447313,1121928,776542,1091793,411489,1905428,1107216,1106272,1095900,1083528,1109805,1085789,820419,1131370,1880098,559839,1094807,1105615,1305368,941528) ORDER BY field (ArticleID,1103390,364122,3418318,1112832,1119281,1083445,714982,1083195,1114148,417730,447313,1121928,776542,1091793,411489,1905428,1107216,1106272,1095900,1083528,1109805,1085789,820419,1131370,1880098,559839,1094807,1105615,1305368,941528)