电力系统静态安全分析指应用()计算的方法,根据N-1原则,检验电网结构强度和运行方式是否满足安全运行的要求。
A.稳定
B.电压
C.频率
D.潮流
参考答案:D
Sometimes, it is hard for one to handle the between one's duty and one's desires. [ ]
A. conflict
B. agreement
C. satisfaction
D. discussion
一个因数不变,另一个因数扩大或缩小为原来的若干倍,积也扩大或缩小为原来的( )的倍数。