延时固化混纤维酚醛树脂覆膜砂LH-Ⅱ研制
연시고화혼섬유분철수지복막사LH-Ⅱ연제
Preparation of Fiber Admixtured Phenolic Resin Coated Sand as Sand Controlling Agent LH-Ⅱ with Delayed Curing Time
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