物理中的m代表什么

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select * from tbl_Articles WHERE ArticleID=332901 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=332901 LIMIT 0,1
select * from tbl_Articles_sphinx where id=332901 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1094895,1062866,1062364,1064643,1055678,1488567,997072,1124400,1065085,1065569,1052191,1060755,1500507,1069637,1054934,1027251,1119560,1062066,993095,1112702,1130997,1067115,1062712,1065449,1055824,1064147,1061518,1459281,1067315,1085912) ORDER BY field (ArticleID,1094895,1062866,1062364,1064643,1055678,1488567,997072,1124400,1065085,1065569,1052191,1060755,1500507,1069637,1054934,1027251,1119560,1062066,993095,1112702,1130997,1067115,1062712,1065449,1055824,1064147,1061518,1459281,1067315,1085912)