[多选题] 操作中发生带负荷拉、合刀闸应该如何处理?()
A. 若发生带负荷拉刀闸,应立即合上该刀闸
B. 若发生带负荷合刀闸,应立即拉开该刀闸
C. 带负荷合刀闸时,即使发现合错,也不准将刀闸再拉开。因为带负荷拉刀闸,将造成三相弧光短路事故
D. 带负荷错拉刀闸时,在刀片刚离开固定触头时,便发生电弧,这时应立即合上,可以消除电弧,避免事故。但如刀闸已全部拉开,则不许将误拉的刀闸再合上

The outside world begins creeping into the schools when the children reach the age of 13 and older, the age when they begin to make subject choices and when, according to a careers officer,“they know if they’re a scientific lot or more inclined to the arts”. The difficult part is bringing the outside world to life with all its opportunities and realities. Schools are handicapped because they are staffed by people who only know about schools. Careers services are heavily influenced by what is readily available in the area, which may be sausage making in Wiltshire or shipbuilding in riverside. Somewhere out in the world there are landscape gardeners and girls who polish Elizabeth Taylor’s diamonds, but the careers officer knows little of them. What he knows about is engineering and hairdressing (理发,美容)and opportunities in the Army. It is not surprising that this constant friction (摩擦) between grand aspirations and uninspired reality produces cynicism
A. they feel they are misled by careers officers
B. they can't accomplish in reality their strong desires to become scientists or to do something great
C. what they learn at school is quite different from what they see in society
D. they me treated unfairly in society