28.在氣相層析(GC)法中，下列哪一種偵檢器最被廣泛使用？ (A)火焰游離型偵檢器(Flame ionization detector; FID) (B)熱導型偵檢器(Thermal conductivity detector; TCD) (C)電子捕捉型偵檢器(Electron-capture detector; ECD) (D)光游離型偵檢器(Photoionization detector)