请问一公顷等于多少km2

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select * from tbl_Articles WHERE ArticleID=272429 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=272429 LIMIT 0,1
select * from tbl_Articles_sphinx where id=272429 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1104335,2688231,2553316,1129329,3252256,1892551,1096280,2199078,2740515,2784437,1096527,1125401,2413879,1557801,1127123,2899551,1098809,1077671,1079217,1103718,2233911,2722979,1102630,3376896,305480,1104635,1059515,2502606,1131747,2463107) ORDER BY field (ArticleID,1104335,2688231,2553316,1129329,3252256,1892551,1096280,2199078,2740515,2784437,1096527,1125401,2413879,1557801,1127123,2899551,1098809,1077671,1079217,1103718,2233911,2722979,1102630,3376896,305480,1104635,1059515,2502606,1131747,2463107)