50um等于多少毫米

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select * from tbl_Articles WHERE ArticleID=2428434 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2428434 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2428434 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(141325,916663,438663,128955,894697,365705,291588,300775,1318921,1282491,371352,349784,149038,665053,926387,264655,1601829,574210,1118599,252505,537457,607934,1065569,1092450,627806,3235390,475437,1115001,128538,2636621) ORDER BY field (ArticleID,141325,916663,438663,128955,894697,365705,291588,300775,1318921,1282491,371352,349784,149038,665053,926387,264655,1601829,574210,1118599,252505,537457,607934,1065569,1092450,627806,3235390,475437,1115001,128538,2636621)