电力系统三相短实用计算主要是计算容量电源(同步发电机)供电时,电力系统三相短路电流周期分量的有效值,该有效值是的。
无限大电源系统发生三相短路时,短路电流的分量幅值在暂态过程中不变,短路电流的非周期分量的值在短路瞬间最大,在暂态过程中以时间常数按规律衰减,并最后衰减为零。
Matching:_________1. Extroverted leaders always receive great attention whatever the actual performance._________2. Introverts are acceptable by other people because they have more patience to listen to others than extroverts._________3. Introverts get energy from being alone._________4.Studies show a relationship between the types of leadership style needed and the personalities and behavior of employees._________5. It’s the high time to balance the introverted the extroverted leadership style.
品牌的作用有哪些?
A. 品牌是产品或企业价值的体现
B. 品牌是识别商品的分辨器
C. 品牌是质量和信誉的保证
D. 品牌是企业的“摇钱树”