香气分析 提取 Extraction 浓缩 Concentration GC 2D-GC 分离 RI Separation GC-Olfactometry NMR/IR 鉴定 Identification 7 香气分析 GC-Olfactometry 分离 Separation 提取 Extraction 浓缩 Concentration 鉴定 Identification GC 2D-GC RI GC-MS NMR/IR