Lignin is a characteristic component of secondary walls.木质素是次生壁成份的特征.A new syntan product prepared with tar phenol and lignin sulfonic acid.以工业副产物木素磺酸和焦油酚为主要原料研制出一种新的合成鞣剂.Alkali lignin is an abundant, cheap and renewable...
a premise that allow of only one conclusion假设容许只有一个结论I disagree with the premise that economic development has priority over the environment.我不赞成经济发展应优先于环境保护这个前提。Electrification of the countryside is the premise of agric...