电动车显示速度仪表的原理是啥

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select * from tbl_Articles WHERE ArticleID=1964204 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1964204 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1964204 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(439040,587454,3220748,374763,1076142,3472007,2846985,2788544,951658,404721,3127360,1341810,1079407,1646295,3280445,1539369,1956282,2503416,3232229,2818739,577579,425131,3353507,1138014,2230489,1446469,1774815,1131438,882000,1121131) ORDER BY field (ArticleID,439040,587454,3220748,374763,1076142,3472007,2846985,2788544,951658,404721,3127360,1341810,1079407,1646295,3280445,1539369,1956282,2503416,3232229,2818739,577579,425131,3353507,1138014,2230489,1446469,1774815,1131438,882000,1121131)