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.

标记用的荧光素应满足的要求不包括（）

A.应具有能与蛋白质分子形成离子键的化学基团

B.荧光效率高

C.荧光色泽与背景组织的色泽对比鲜明

D.标记方法简单，安全无毒

E.与蛋白质的结合物保持原有的生化免疫性质，稳定易保存