The nurse is preparing to remove a previously applied topical medication from a client. The rationale for removing previously applied topical medications before applying new medications is to

A. decrease the possibility of absorption on the nurse’s skin.
B. allow distribution of medication.
C. prevent soiling of the client’s clothes.
D. avoid administering more than the prescribed dos

硫醇汞法测定青霉素V钾片含量时，所用对照品是

A．费休法
B．铂电极
C．汞-硫酸亚汞电极
D．萘
E．青霉素V