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该课题于1989年11月由机电部机械科学研究院主持,在沈阳铸造研究所通过鉴定。与会代表一致认为:1．在真空自耗凝壳炉中,采用
The subject in November 1989 by the Ministry of Mechanical and Electrical Machinery Institute of Science and Technology, Institute of foundry in Shenyang passed the appraisal. The participants agreed that: 1. Self-consumption in the vacuum coagulation shell furnace, used