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本文对覆膜砂主要原材料──酚醛树脂及原砂有关性能作了技术分析，并介绍了作者在这些方面的研究成果。
In this paper, the main raw material of coated sand ─ ─ phenolic resin and the relevant performance of the original sand made a technical analysis, and introduced the author’s research in these areas.