一只金刚鹦鹉站在栖木上冲他尖叫。A macaw screeched at him from its perch.鸟停歇在栖木上.The bird took its perch.其它保护措施是可在种子园中到处设置木制的栖木.Other protection can be obtained by providing wooden perches througout the orchards....
Antioxidant tertiary butyl hydroquinone was prepared by hydroquinone and tertiary butyl alcohol.由对苯二酚与叔丁醇反应制得抗氧化剂叔丁基对苯二酚.They were good catalyst for synthesis of n - butyl cinnamate.它们是催化合成肉桂酸正丁酯的良好催化剂.A method of synthe...