【简答题】简单电力系统如题图所示,各元件参数如下。 发电机G:P N =250MW,COSφ N =0.85,V N =10.5kV,x d =1.7,x' d =0.25,T J =8S; 变压器T-1:S N =300MV·A,V S %=15,k T =10.5/242; 变压器T-2:S N =300MV·A,V S %=15,k T =220/121; 线路L:l=250km,V N =220kV...
【简答题】已知图10中 I1=4A,I2=2A, I3=-2A,其他参数及参考方向如图所示。____试求元件两端电压Ux,并确定电路元件x是电源还是负载;____两个电阻上消耗的功率 第11题: V X =R 1 I 1 +E 1 =50V; Px=V 3 I 3 =-100WL 0 ; X是负载充电 P E =E 1 I 1 =400W____
【简答题】Please translate the following letter into English. You are supposed to supply some necessary information such as the name, address and telephone number of a corporation..., etc. on your own as reques...
【简答题】Case One Dear Mr. Smith , (从我国驻贵国商务参赞处得知贵公司的名称和地址) as the leading importer of light industrial products in your country. We now . (利用此次机会给你方写信了解我方是否可以与你方建业业务关系 . , (为使你方了解我们经营的轻工业产品) , we are airmaili...