什么是上行端口

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select * from tbl_Articles WHERE ArticleID=2705266 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2705266 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2705266 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1042765,1063671,1112114,1103432,1112871,1072314,1068212,1067327,1108890,1075482,1057607,1076764,1048112,1065221,1045843,1076059,1073397,1067487,1068782,1065019,1084823,1046402,1054942,1074923,1087779,1072050,1073407,1081247,1072443,1110730) ORDER BY field (ArticleID,1042765,1063671,1112114,1103432,1112871,1072314,1068212,1067327,1108890,1075482,1057607,1076764,1048112,1065221,1045843,1076059,1073397,1067487,1068782,1065019,1084823,1046402,1054942,1074923,1087779,1072050,1073407,1081247,1072443,1110730)