Conclusion: Silica gel column chromatography and crystallization are simple and rapid Methods: To isolate gardenoside.结论: 柱层析和重结晶方法是简单、速分离栀子苷的有效办法.This paper advances the preparation method of erucamide by direct ammonol...
大多数难民等待救济的地方都不能挡风遮雨。The area where most refugees are waiting is exposed to the elements.寻求避难者中有不到7%的人被视作政治难民。Fewer than 7% of asylum seekers are accepted as political refugees.成千上万的难民涌入拥挤不堪的城镇和村庄。Thousands of refugees ar...