隐匿式职业性中毒较为少见，我市乡镇企业中，曾先后发生三起，兹报道如下。１典型事例【例１】某乡办化工厂将含镍废塑料经化学处理后提取氯化镍，已生产数年，尚未发生中毒。为降低成本，１９９７年１０月２日该厂在中间工段试用加入硫酸（第一次试验），当时立即产生大... Occult occupational poisoning is relatively rare, the township enterprises in our city, there have been three cases, it is reported as follows. A typical case [Example 1] A township chemical plant will be nickel-containing plastic waste after chemical treatment of nickel chloride, has been produced for several years, has not yet been poisoned. To reduce costs, October 2, 1997 trial of the plant in the middle of the trial to join sulfuric acid (the first test), then immediately produce large ...