——I’m so happy that you could come to English land with us for the holidays. ——_________ . It’s the first time for me to be out of china.
电路图如图11所示,开关S闭合前已处于稳定状态。t=0时开关S闭合,已知:US=40V,IS=5A,R1=R2=20Ω,L=2H;(15分)(1)求t≥0时的电感电流iL(t)和电压uL(t);(2)画出电感电流iL(t)和电压uL(t)的变化曲线的草图。 图11
以下程序的运行结果是( )。 void main() {int s = 0, i = 0; while(i< 8) { i++; if(i%2==0) continue; s+=i; } printf("%d\n",s); }