【简答题】A Chinese bank issued standby L/Cs totaling millions of US dollars, in favor of an US company. These were irrevocable, transferable standby L/Cs valid for one year....”It has no obligation to repay pr...
【简答题】某三相异步电动机 , P N = 30 kW , U N = 380 V , 三角形联结 , I N = 63A , n N = 740 r/min , K S = 1.8 , K C = 6 , T L = 0.9 T N , 由 S N = 200kV·A 的三相电源变压器供电,电动机起动时,要求从三相电源变压器取用的电流不得超过变压器的额定电流。 试问: (1) 能否直接起动? (2) 能否...