物理中的f和F分别表示什么

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1108990,1094393,1016441,1095554,1103037,1072753,1065917,1062973,1074851,1085576,1105029,1077496,1064645,1092365,1074272,1115563,1066888,1120410,1078424,1108219,981687,1081969,1085842,1060391,1304604,1106647,1082318,1084197,1059338,1062140) ORDER BY field (ArticleID,1108990,1094393,1016441,1095554,1103037,1072753,1065917,1062973,1074851,1085576,1105029,1077496,1064645,1092365,1074272,1115563,1066888,1120410,1078424,1108219,981687,1081969,1085842,1060391,1304604,1106647,1082318,1084197,1059338,1062140)