Nitroglycerin is also available in ointment or paste form. Before applying nitroglycerin ointment, what should the nurse do first

A．Cleanse the skin with alcohol where the ointment will be placed.

B．Obtain the client's pulse rate and rhythm.

C．Remove the ointment previously applied."

D．Instruct the client to expect pain relief in the next 15 minutes.

患者，男性，30岁，上颌窦癌术后5个月，癌转移。患者口腔内有脓性分泌物，细菌培养结果为铜绿假单胞菌感染。

口腔护理时，护士应选用的漱口液是

A．0.9%氯化钠溶液

B．0.1%醋酸

C．0.02%呋喃西林溶液

D．1%～3%过氧化氢溶液

E．2%～3%硼酸溶液