在中性点非直接接地电网中，单相接地及由电压互感器(PT)引起的谐振过电压均是多发性的事故。
In ungrounded distribution system the single-phase-grounding and the ferro-resonance caused by the PT (Potential Transformer) are of the frequent accidents.
鸟撞是飞机在飞行中遇到的重要危害之一，同时也是一种突发性和多发性的飞行事故，造成了重大的经济损失和人员伤亡。
Bird strike represents one of the serious flight accidents. It is paroxysmal and universal, usually resulting in a huge economic and life lost.
鸟撞是飞机在飞行中遇到的重要危害之一，同时也是一种突发性和多发性的飞行事故，造成了重大的经济损失和人员伤亡。
Bird strike represents one of the serious flight accidents. It is paroxysmal and universal, usually resulting in a huge economic and life lost.
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