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      煉油設備阻垢劑的制備方法 發布日期:2017-05-25

      (1)聚烯基丁二酰亞胺烷基酚醛縮合物的制備:按照質量比為l:1稱取多亞乙基多胺、溶劑二甲苯置于裝有攪拌器、溫度計、分水器和滴液漏斗的四口瓶內,開攪拌器油浴加熱,待溫度升......

      ? 曰本真人免费做爰三级视频
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