比毫米小的单位是什么

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select * from tbl_Articles WHERE ArticleID=1217063 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1217063 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1217063 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(383456,1089652,1119540,1110942,473840,1121122,391825,1085552,1113177,1095145,471182,626662,603868,1115587,1117644,438802,378024,527192,1110299,1092081,1105379,469321,2825439,1113135,511395,1115317,1116097,1114256,1122831,1115751) ORDER BY field (ArticleID,383456,1089652,1119540,1110942,473840,1121122,391825,1085552,1113177,1095145,471182,626662,603868,1115587,1117644,438802,378024,527192,1110299,1092081,1105379,469321,2825439,1113135,511395,1115317,1116097,1114256,1122831,1115751)