什么叫坍落度

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select * from tbl_Articles WHERE ArticleID=2792036 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2792036 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2792036 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1060503,1089842,1089838,1090310,1085390,1065195,1071697,1068154,1068358,1073528,1063929,1057471,1078428,1041439,1074892,1091757,1086370,1081441,1073272,986394,1077960,1015577,1070232,1118338,1083087,1057076,1055423,1081187,1081895,1052943) ORDER BY field (ArticleID,1060503,1089842,1089838,1090310,1085390,1065195,1071697,1068154,1068358,1073528,1063929,1057471,1078428,1041439,1074892,1091757,1086370,1081441,1073272,986394,1077960,1015577,1070232,1118338,1083087,1057076,1055423,1081187,1081895,1052943)