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1991年6月1日上午10时,从宣威开往曲靖的长途客车,在行驶了约25分钟时,一名乘客携带的提箩突然发生爆炸,当场重伤4人,轻伤多人。 事故原因为硝酸爆炸,是某厂职工宋×于1991年5月25日向他人索要,含量为97％的优级纯发烟硝酸。将其装在一个洗净的“三乙醇胺”试剂瓶内,约400ml,具塞盖,密封情况较好。放置阳台数日(每天光照约4个小时),6月1日取走带上汽车,置于距发动机盖0.5米处而发生爆炸。
At about 10 a.m. on June 1, 1991, a long-distance passenger car bound for Qujing from Xuanwei was driven for about 25 minutes. Suddenly, an escalator carried by a passenger exploded, injuring four people on the scene and slightly injuring many others. The reason for the accident was a nitric acid explosion. It was a premium grade pure fuming nitric acid that was obtained from Song X, a plant worker, on May 25, 1991, to other people for a content of 97%. Pack it in a clean “triethanolamine” reagent bottle, ca. 400ml, capped and sealed. Place the balcony a few days (about 4 hours of light per day), take the car on June 1, placed at 0.5 m from the engine cover exploded.