心房颤动
A．第一心音增强B．心牢小于脉率C．心室律绝对不规则D．心尖部3/6级收缩期杂音
参考答案：C
已知非负数a，b，c满足条件a+b=7，c-a=5，设S=a+b+c的最大值为m，最小值为n，则m-n的值为（ ）。
The nurse is caring for a client with acute pulmonary edema. To immediately promote oxygenation and relieve dyspnea, which of the following interventions is appropriate（）
A. Administer oxygen.
B. Have the client take deep breaths and cough.
C. Place the client in high Fowler’s position.
D. Perform chest physiotherapy.
