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本交作者白洪亮同志系上海工具厂工人,文中总结了不少宝贵的实际经验,值得本专业工作者参考采用。编者对来稿仅在文字上作了某些修改。——编者注
The author Bai Hongliang Department of Shanghai Tool Factory workers, the article summed up a lot of valuable practical experience, it is worth using the reference of professional workers. The editor made some changes to the manuscript only in words. - Editor’s Note