一台三相4极感应电动机，己知电源频率f=50Hz，额定转速=1450r/min,其转差率为（）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='32657' and id < 2596576 and id<>'2596576' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32657' and id > 2596576 and id<>'2596576' order by id asc limit 5