解释一下烃类是什么

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select * from tbl_Articles WHERE ArticleID=1345156 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1345156 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1345156 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1115699,1072093,1109517,1082303,1083421,1071645,1069059,1111930,1062346,1106192,1121170,1063619,1090196,1056858,1067397,1076656,1126506,1053404,1068016,1125590,1123553,1107392,1076241,1075881,1109118,1101319,988570,1074686,1116819,1045655) ORDER BY field (ArticleID,1115699,1072093,1109517,1082303,1083421,1071645,1069059,1111930,1062346,1106192,1121170,1063619,1090196,1056858,1067397,1076656,1126506,1053404,1068016,1125590,1123553,1107392,1076241,1075881,1109118,1101319,988570,1074686,1116819,1045655)