19 國內濫用藥物尿液檢驗作業準則中規定，確認檢驗結果在閾值（cutoff）以上者應判定為陽性，下列之閾值何者正確？ (A)大麻代謝物 15 ng/mL、古柯鹼代謝物 150 ng/mL (B)可待因 300 ng/mL、安非他命 300 ng/mL (C)安非他命 500 ng/mL、古柯鹼代謝物 300 ng/mL (D)嗎啡 300 ng/mL、大麻代謝物 50 ng/mL

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

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