Under the condition of existence of catalyst and toluene as solvent,mono polyethylene glycol maleate was synthesized by direct esterification of maleic anhydride and polyethylene glycol(400).是什么意思_Under the condition of existence of catalyst and toluene as solvent,mono polyethylene glycol maleate was synthesized by direct esterification of maleic anhydride and polyethylene glycol(400).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句