采用特殊金属材料作灭弧触头的原理是(    )。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69520' and id < 4503867 and id<>'4503867' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69520' and id > 4503867 and id<>'4503867' order by id asc limit 5