假设短路点不准确,即“那么发生短路时”短路点在何处未知；
金属性或近金属性短路,从短路点至后级的负荷端几乎无电流通过,当然不会烧毁后级用电器；
短路点至电源侧间的用电器会过流.
判断正误：Every Saturday morning,there is a line of boys and girl
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