功率方向元件如果TV或者TA其中一个极性接反的话，会造成反方向动作，正方向拒动。（ ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id < 4501586 and id<>'4501586' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id > 4501586 and id<>'4501586' order by id asc limit 5