答案：C
The nurse is giving instructions to a client who is going home with a cast on his leg. Which point is most critical
A. Using crutches properly.B. Exercising joints above and below the cast, as ordered.C. Avoiding walking on a leg cast without the physician’s permission.D. Reporting signs of impaired circulation.
久期的概念最早来自( )对债券平均到期期限的研究。
A．麦考莱
B．特雷诺
C．夏普
D．罗斯
