如何将pdf文件里的印章去掉

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select * from tbl_Articles WHERE ArticleID=3187772 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3187772 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3187772 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1091625,1299062,1063671,1074298,1083141,1088694,1077102,1117055,1087485,1132159,1102022,1108496,1061328,1060817,1109831,1084307,1098403,1046963,1081422,1049048,1071131,1062930,1089832,1089526,1100033,1089506,1067265,1064449,980285,1075710) ORDER BY field (ArticleID,1091625,1299062,1063671,1074298,1083141,1088694,1077102,1117055,1087485,1132159,1102022,1108496,1061328,1060817,1109831,1084307,1098403,1046963,1081422,1049048,1071131,1062930,1089832,1089526,1100033,1089506,1067265,1064449,980285,1075710)