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且目名称年期总期 试验研究 加工球墨铸铁所用磨料磨具及磨削工艺时研究 上海机床厂 上海砂轮厂“球墨铸铁加工”试验组 郑州磨料磨具磨削研究所产磨炯球砂轮质量的改进 第一砂轮厂技术科工艺组 碳化硅冶炼炉热量平衡的研究 第二砂轮厂援外办公室 优选法在棕刚玉冶炼中的应用 ?
And the name of the term period of the total period of the pilot study of ductile iron abrasive grinding process and grinding process Shanghai Machine Tool Works Shanghai Wheel Factory “ductile iron processing” test group Zhengzhou abrasive grinding Institute Grinding Jiong ball grinding wheel quality Improvement of heat balance of silicon carbide smelting furnace in No.1 Grinding Wheel Works Technology Group of Ministry of Science and Technology