冠脉手术麻醉维持下述何者最佳（） A.恩氟烷、氧化亚氮+芬太尼4～6μg/kg B.

During afternoon rounds, the nurse finds a male client using a pencil to scratch inside his knee-to-toe cast. The client is complaining of severe itching in the ankle are

a. Which action should the nurse takeA. Allow him to continue to scratch inside the cast with a pencil.B. Give him a sterile metal object to use for scratching instead of the pencil.C. Encourage him to avoid scratching, and obtain an order for diphenhydramine (Benadryl) if severe itching persists.D. Obtain an order for a sedative, such as diazepam (Valium), to prevent him from scratchin

解方程：（1）x²-3x-1=0

（2）（x-3）²+4x（x-3）=0．

某公司从本年度起每年年末存入银行一笔固定金额的款项，若按复利制用最简便算法计算第n年末可以从银行取出的本利和，则应选用的时间价值系数是（）。

A.复利终值数

B.复利现值系数

C.普通年金终值系数

D.普通年金现值系数

亚急性细菌性心内膜炎时，下列病变哪项是错误的

A．脾脏肿大

B．皮肤环形红斑

C．皮肤粘膜出血点

D．心瓣膜赘生物

E．肾梗死

病毒具有什么重要基本特征。