说明：  上海辅导班培训讲义08-短路电流计算:内容包括短路电流计算目的、主要短路电流数值及用途、高低压系统短路电流计算
(Shanghai remedial classes training overhead 08-Short-circuit current calculation : content including short-circuit current calculation purposes, Numerical main short-circuit current and uses low-pressure system high short-circuit current calculation )