请问400微克等于多少毫克

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select * from tbl_Articles WHERE ArticleID=307364 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=307364 LIMIT 0,1
select * from tbl_Articles_sphinx where id=307364 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(4152575,4138054,4054178,3958100,3774856,3671130,3638041,3621216,3621173,3621104,3621047,3620996,3608439,3608371,3608342,3608329,3608257,3608251,3607855,3606443,3601661,3593496,3588834,3578651,3558365,3556795,3553853,3553253,3552621,3551708) ORDER BY field (ArticleID,4152575,4138054,4054178,3958100,3774856,3671130,3638041,3621216,3621173,3621104,3621047,3620996,3608439,3608371,3608342,3608329,3608257,3608251,3607855,3606443,3601661,3593496,3588834,3578651,3558365,3556795,3553853,3553253,3552621,3551708)