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研制了一种新型混合硬化剂MgCl_2·6H_2O-NH_4Cl,讨论其混合比例、硬化效能、型壳性能及生产控制等问题。
A new kind of mixed hardener MgCl_2 · 6H_2O-NH_4Cl was developed to discuss the mixing ratio, curing efficiency, shell properties and production control.