什么叫做铵根离子中的n

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select * from tbl_Articles WHERE ArticleID=109585 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=109585 LIMIT 0,1
select * from tbl_Articles_sphinx where id=109585 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1055361,1061928,1068830,3173365,1049542,1124997,1060169,1049398,1065091,1067017,1127597,1021036,1048110,1061594,1069793,1118338,1053204,1049548,1061744,1071243,1056858,1044867,1061942,1062062,1073772,2662119,1062973,1072443,1107118,1060817) ORDER BY field (ArticleID,1055361,1061928,1068830,3173365,1049542,1124997,1060169,1049398,1065091,1067017,1127597,1021036,1048110,1061594,1069793,1118338,1053204,1049548,1061744,1071243,1056858,1044867,1061942,1062062,1073772,2662119,1062973,1072443,1107118,1060817)