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宁夏读者李四维来信说,我厂在生产手工卷簧时,常出现一些缺陷,希望本刊介绍一些有关这方面的控制方法。
Li Siwei, a reporter from Ningxia University, wrote that my factory often has some flaws in the production of hand-wound coils and hoped that this magazine will introduce some control measures in this regard.