The sample, after being purged by reversed extraction and purified byPVP - kieselguhr column, was enriched through Amberlite XAD - 7 column. 样品经过乙酸乙酯反萃取及PVP - 硅藻土层析柱后, 再径XAD - 7柱浓缩.
They tried everyway to find the solution.他们想尽办法来解决问题.They tried everyway to find the information.他们用各种方法试图找到资料.Their competitors tried everyway to find the information.他们的竞争者想尽方法去获取该项情报....