It is illegal to paint sparrows to sell them as parakeets.将麻雀彩绘成鹦哥出售是违法的.They're generally agreed to be crimson - fronted parakeets, native to Central America.它们被公认为是原产于中美洲的一种头部呈深红色的长尾小鹦鹉.Against it, parakeets and t...
The carbene also reacts with alcohols.碳烯也可与醇反应.New , sterically demanding 1, 3 - dialkylimidazolinium salts used as N - heterocyclic carbene precursors were synthesized and characterized.合成并表征了一种新型的有空间需求的N - 杂环卡宾前驱体1, 3-...