腋部、胸、背部、侧胸壁、上臂烧伤时,上肢充分外展位,最好呈()
A.15°~30°
B.90°
C.70°~90°
D.中立位
E.10°~20°
参考答案:B
You are analyzing a sample of money manager's returns from a population of 900. According to Chebyshev's inequality, what is the minimum number of managers would you expect to lie with- in 2.5 standard deviations of the mean return()
A. 360.
B. 540.
C. 756.
对于输配水工程,有多种进行技术经济比较的方法。评价中最为普遍的比较参数是()。
a、初投资、使用成本
b、投资分析
c、总的寿命周期成本
d、以上均正确