如何调PDF分辨率

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select * from tbl_Articles WHERE ArticleID=3390910 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3390910 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3390910 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2063130,1065675,2244929,2913801,2721596,1085008,248090,2594215,1947997,1125249,273284,1125060,1123835,2939465,2790518,1126470,1594020,1132577,2839198,2976835,1982888,1404668,1125395,2337075,3232603,620030,1975168,1297519,3019005,2232031) ORDER BY field (ArticleID,2063130,1065675,2244929,2913801,2721596,1085008,248090,2594215,1947997,1125249,273284,1125060,1123835,2939465,2790518,1126470,1594020,1132577,2839198,2976835,1982888,1404668,1125395,2337075,3232603,620030,1975168,1297519,3019005,2232031)