a few new development methods of tlc are introduced which are half-way development relay development multidimensional r elay development improved two-dimensional development and a simple mode of the descending-development
介绍了几种新的薄层色谱展开方法，即半展开法、接力展开法、多维展开法、改进的二维展开法和简单的下降展开法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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