为什么零线对地电压为0

页面:/news/view-149100/ | 耗时:0.9364 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=149100 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=149100 LIMIT 0,1
select * from tbl_Articles_sphinx where id=149100 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1087745,2321179,2399390,309400,185962,720288,1041269,1449579,1073286,1603103,1058033,262228,1087924,561339,262565,1075959,1080529,312102,2921117,1082357,1491425,195204,215445,1671019,575710,1027251,1121164,1086097,201279,791454) ORDER BY field (ArticleID,1087745,2321179,2399390,309400,185962,720288,1041269,1449579,1073286,1603103,1058033,262228,1087924,561339,262565,1075959,1080529,312102,2921117,1082357,1491425,195204,215445,1671019,575710,1027251,1121164,1086097,201279,791454)