怎么用万用表判断直流电机的好坏

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select * from tbl_Articles WHERE ArticleID=1844364 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1844364 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1844364 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1973576,1121904,1106084,2465441,1087863,1118312,1046666,1103724,1109977,1077818,1081859,1112336,1060275,1065773,1114546,1071149,1097235,1108293,1073066,1062406,1108315,1080301,1065863,1082469,1067567,1113514,1062116,1071189,1097743,1065605) ORDER BY field (ArticleID,1973576,1121904,1106084,2465441,1087863,1118312,1046666,1103724,1109977,1077818,1081859,1112336,1060275,1065773,1114546,1071149,1097235,1108293,1073066,1062406,1108315,1080301,1065863,1082469,1067567,1113514,1062116,1071189,1097743,1065605)