c小调为什么有三个降号

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select * from tbl_Articles WHERE ArticleID=2840477 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2840477 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2840477 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1041978,1128407,1062880,1094057,1065049,1050623,1089522,1096527,1115463,1061798,1083453,1066594,1133371,1084587,1123965,1083059,1075672,1131323,1081123,1065431,1067631,1079368,1077208,1097801,1045161,1125005,1102742,1125528,1101197,1074700) ORDER BY field (ArticleID,1041978,1128407,1062880,1094057,1065049,1050623,1089522,1096527,1115463,1061798,1083453,1066594,1133371,1084587,1123965,1083059,1075672,1131323,1081123,1065431,1067631,1079368,1077208,1097801,1045161,1125005,1102742,1125528,1101197,1074700)