This preparation uses dialkyl imidazole salt, alkyl pyridine salt or caprolactam and fatty acid as reactant.该方法使用带有二烷基咪唑盐 、 烷基吡啶盐或者己内酰胺和脂肪酸作为反应物.Thus the term dialkyl carbonate includes, for example, methyl ethyl carbona...
雀麦草到处可以生长,无论是沙漠还是山顶.Cheat grass can grow anywhere from deserts to mountain tops.雀麦不是一种非常常见的杂草,它主要分布在谷类作物中.Chess is not a very common weed and is mainly found in cereal crops.夏季是混播草地中无芒雀麦种群衰退的关键时期.Summer was the pivotal p...