简要描述导致“8· 1 4”美加大停电事故的人为因素 ,并对产生这种人为因素的原因做出推测 ,最后结合华北网调和京津唐中调调度岗位的具体情况提出相应的建议 Briefly describe the human factors that led to the U.S.-8,16 power outage accident in the “8.14” period and make a speculation on the causes of such human factors. Finally, we put forward the corresponding suggestions based on the specific situations of the North China network and the Beijing-Tianjin-Tangning Middle-level transfer jobs