10 Rf value 為層析法常用指標，其定義為 Rf =A/B，下列何者為此公式之 A？ (A)待測物移動距離 (B)溶媒移動距離 (C)溶媒之流速 (D)溶媒之體積

5 固相萃取法（solid-phase extraction）之操作步驟順序，下列何者正確？ (A) column conditioning → sample application → column drying → column wash → elution of drugs (B) column conditioning → sample application → column wash → column drying → elution of drugs (C) sample application → column wash → column drying → column conditioning → elution of drugs (D) sample application → column conditioning → column drying → column wash → elution of drugs

10 R_f value 為層析法常用指標，其定義為 R_f =A/B，下列何者為此公式之 A？
(A)待測物移動距離
(B)溶媒移動距離
(C)溶媒之流速
(D)溶媒之體積

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