The reactivity of wheat straw soda lignin ( WSSL ) can be improved by demethylation modification.麦草 碱木素在碱催化下经脱甲基改性可提高其反应活性.Benzbromarone was synthesized from salicylaldehyde by condensation with chloroacetone, reduction,...
Garnish the plate with whipped cream rosettes and fresh fruits.用玫瑰花形的掼奶油和新鲜的水果作配菜点缀盘子。Visitors see the painting from behind a plate glass window.参观者隔着平板玻璃橱窗欣赏那幅画。On the table beside an empty plate was a pile of books.桌上空...