Anhydride - type curing agents require the application of heat to promote polymerization.酸酐类固化剂则要求加热以促进聚合反应.Exothermic reaction can be reduced by adding hexahydrophthalic anhydride to the phthalic anhydride.用六氢化邻苯二酸酐加入到邻...
Calcium is excreted in the urine and stools.钙通过尿液和粪便排出体外。The larvae may be excreted in the faeces.幼虫会连同粪便排出.Most toxins are naturally excreted from the body.大部分毒素被自然排出体外....
Based on the reactions , this paper reports research for synthesizing benzaldehyde.简要介绍以此类方法对合成苯甲醛的研究.Natural benzaldehyde is prepared by hydrolysis cassia leaf oil.从桂叶油出发,通过碱性水解制备天然苯甲醛.Pitch resin was synthesized from b...