两种双醛的加入对砂用热塑性酚醛树脂部分指标及游离酚含量的影响
량충쌍철적가입대사용열소성분철수지부분지표급유리분함량적영향
Influence of two kinds of Dialdehyde Addition on Free Phenol Content and Some Indicators of Sand Novolac
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