说明文的说明对象应具有哪些特点

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select * from tbl_Articles WHERE ArticleID=247486 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=247486 LIMIT 0,1
select * from tbl_Articles_sphinx where id=247486 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1093140,1096989,1112891,1064299,1103841,1062602,1100667,1057383,1100985,1097815,1370914,1110405,1081859,1110658,1103287,1088694,1110157,1071972,1093152,1069889,1084471,1110031,336525,1069221,1100575,1084259,1111248,1098893,1089464,1106232) ORDER BY field (ArticleID,1093140,1096989,1112891,1064299,1103841,1062602,1100667,1057383,1100985,1097815,1370914,1110405,1081859,1110658,1103287,1088694,1110157,1071972,1093152,1069889,1084471,1110031,336525,1069221,1100575,1084259,1111248,1098893,1089464,1106232)