无穷大功率电源供电系统,三相短路电流中含有哪些分量电流?各有什么特点?
参考答案:
周期分量电流,特点是三相对称,幅值不变;非周期分量电流,特点是衰减。
The most energetic and important festivals are ______ look forward to the end of winter and to the
coming of spring. [ ]
A. the ones that
B. ones that
C. that
D. the ones
为什么说资本主义国家敢于不能从根本上消除资本注意基本矛盾和经济危机?