使用HPLC 法進行分析時,下列何種定量方法對於ointment、cream 這些萃取較為複雜的製劑最為恰當?
(A)Normalized peak area
(B)External standard calibration
(C)Internal standard calibration
(D)Method of standard addition
液相層析管之HETP(height equivalent to a theoretical plate)值愈大,則此層析管之分離效果會如何?
(A)越好
(B)越差
(C)無關
(D)視分析物而定