什么叫线速度

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(86939,1126157,81197,86225,369333,3192170,1182479,3272613,1099349,362039,1114910,2618210,2627255,1106922,2662919,86270,1095638,100394,857338,408754,1104491,2640259,1938028,81439,1207210,101120,365832,358639,2791793,1116449) ORDER BY field (ArticleID,86939,1126157,81197,86225,369333,3192170,1182479,3272613,1099349,362039,1114910,2618210,2627255,1106922,2662919,86270,1095638,100394,857338,408754,1104491,2640259,1938028,81439,1207210,101120,365832,358639,2791793,1116449)