请问0．3Km等于多少m

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select * from tbl_Articles WHERE ArticleID=1651361 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1651361 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1651361 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(176800,424209,2648905,879174,545185,1123653,345440,189374,954319,2719049,540664,250959,1062602,905211,226043,724365,228947,1076047,635131,438663,782030,950131,529566,443050,269423,1122010,490954,653251,818177,1126626) ORDER BY field (ArticleID,176800,424209,2648905,879174,545185,1123653,345440,189374,954319,2719049,540664,250959,1062602,905211,226043,724365,228947,1076047,635131,438663,782030,950131,529566,443050,269423,1122010,490954,653251,818177,1126626)