A.2.0% B.3.0% C.5.0% D.9.0% E.15.0%
A.先在濃鹽酸溶液中檢查2h B.先在濃鹽酸溶液中檢查1h C.先在磷酸鹽緩沖液(pH6.8)檢查1h D.先在鹽酸溶液中(9→1000ml)檢查2h E.先在磷酸鹽緩沖液(pH6.8)檢查2h
A.20min B.30min C.40min D.50min E.60min