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It was obtained with ethylenediamine and ethenesulfonic sodium as primary material through addition.
采用乙二胺和乙烯磺酸钠为主要原料,经过加成反应合成了乙二胺双乙基磺酸钠.
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Paper pulp is primary material of the insulating carboard, few people are doing research on it.
纸浆是制造绝缘纸板的原材料, 国内外对它研究较少.
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