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日前，上海市某危房改建工程发生了一起并字架升降机坠落的重大事故，上海币某区人民检察院聘请上海市建筑科学研究院对坠落事故进行技术鉴定，要求对升降机的钢丝绳被拉断和吊笼顶部安全装置失灵等原因进行技术鉴定。受该区检察院委托，我们对此起升降机坠落事故的原因进行了?
A few days ago, a dangerous accident occurred in a dangerous building reconstruction project in Shanghai. The Shanghai People’s Procuratorate of a certain area hired the Shanghai Academy of Building Research to carry out a technical appraisal of the falling accident and requested that the ropes of the elevator be pulled off and hoisted. Failure of the safety device at the top of the cage for technical verification. Commissioned by the District Prosecutor’s Office, we conducted the reason for the fall accident of the lift.