在某文献上看到以下一段:The different aliquots of the reacting mixture were analyzed by vapor-phase chromatography on a Girdel Series 3000 apparatus equipped with a flame-ionization detector and a ' i sin . x 5 ft 3% Carbowax 20M on Chromosorb W column. 他们使用的a ' i sin . x 5 ft 3% Carbowax 20M on Chromosorb W column.是个什么性质的色谱柱?我查了一下,没查明白,