1公里等于多少千米？

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select * from tbl_Articles WHERE ArticleID=3450705 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3450705 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3450705 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(367197,3521041,1816585,1194923,1140949,993130,779822,594138,818828,3246261,1163273,3418444,957328,906018,718614,3397256,100621,984505,762269,2615041,1195767,80101,483284,1159550,532937,979915,1167466,1661804,763625,932792) ORDER BY field (ArticleID,367197,3521041,1816585,1194923,1140949,993130,779822,594138,818828,3246261,1163273,3418444,957328,906018,718614,3397256,100621,984505,762269,2615041,1195767,80101,483284,1159550,532937,979915,1167466,1661804,763625,932792)