当绕线式异步电动机的电源频率和端电压不变，仅在转子回路中串入电阻时（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id < 4497289 and id<>'4497289' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id > 4497289 and id<>'4497289' order by id asc limit 5