词汇 1. I can't ____________(发现)my pen.Where is it? 2. The young often ____________(喜爱)action movies. 3. We are in the ____________(同样的)class. 4. That man is an ____________ (男演员). His ____________ movie is ____________(有趣的).
【简答题】一台三相笼型异步电动机 ,其铭牌数据如下表所示。 f P N U N 接法 n N h N cos j N I st / I N T st / T N 50HZ 20KW 220/380V Δ /Y 970 r/min 91.5% 0.84 7.0 2.0 试求以下参数: ( 1 )若电源电压为 380V ,电机应采取何种方式接线? ( 2 )若电源电压为 220V ,电机 Δ 接线接在自耦降压器...