春节英语作文100字(优选5篇)
春节英语作文100字(优选5篇)春节英语作文100字(1) The annual Spring Festival will soon come, everyone is busy to stick couplets on the Spring Festival, every family is jubilant atmosphere, very happy, our f...
2024-05-19 4 0
春节英语作文100字(优选5篇)春节英语作文100字(1) The annual Spring Festival will soon come, everyone is busy to stick couplets on the Spring Festival, every family is jubilant atmosphere, very happy, our f...
正交实验法优选当归多糖的提取工艺摘要 目的:优选并确立当归多糖的最佳提取工艺。方法:以当归多糖得率为指标,采用正交实验法对提取过程中水用量(A),提取时间(B),提取次数(C)及醇沉浓度(D)4因素进行优选研究。结果:对多糖得率有影响的因素是提取时间与提取次数。结论:以多糖得率为考察指标的最优提取工艺为A2B3C2D1。关键词 当归多糖 提取工艺 正...