【单选题】The accident _________ to the man who_________ to be a foreigner, so it is hard todeal with. [ ]
【简答题】________ you met the foreigner from Canada? A. Where it was that B Who it was that C. Where was it that D. Where was that
【简答题】有一台型号为S-560/10的三相变压器,Y,y 0 ~Y,y11接线,额定电压为10000/400V,供照明用电,若在二次接入额定电压220V,额定功率100W的白炽灯,求三相总共可容许接多少盏灯而变压器不过载。
【简答题】A.穿透作用 B.荧光作用 C.生物作用 D.电离作用 E.光化学作用 透视利用X线的
【单选题】_____ you met the foreigner from America? [ ]
【简答题】计算题:有一台型号为S-560/10的三相变压器,Y,y0~Y,y11接线,额定电压为10000/400V,供照明用电,若在二次接入额定电压220V,额定功率100W的白炽灯,求三相总共可容许接多少盏灯而变压器不过载。设白炽灯总盏数为n,由于二次是Y0接法,故二次的相电流=线电流,要使变压器不过载,只要使负载电流不超过I N2 即可。