如何用万用表判断二极管的正负极

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select * from tbl_Articles WHERE ArticleID=2494801 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2494801 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2494801 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1114918,2943344,1080635,1132559,1106116,1071661,1070092,1064861,1088678,1103895,1027251,1101707,1094057,1081835,1083141,1099711,1100873,1078424,1054832,1062566,1064111,1066470,1082309,1107261,1094661,1111384,1111722,1101745,1048506,1105697) ORDER BY field (ArticleID,1114918,2943344,1080635,1132559,1106116,1071661,1070092,1064861,1088678,1103895,1027251,1101707,1094057,1081835,1083141,1099711,1100873,1078424,1054832,1062566,1064111,1066470,1082309,1107261,1094661,1111384,1111722,1101745,1048506,1105697)