肝脏血液供应来自门静脉者占全部血液供给（）
A.100％
B.75％
C.50％
D.25％
E.10％
参考答案：B
两个大小分别为4N和8N的水平力，同时作用置于光滑水平地面上的质量为2kg的物体上，物体获得的加速度可能是（ ）
A．0
B．1m/s2
C．4m/s2
D．8m/s2
An analyst does research about confidence interval and gathers the following information about a stock return. The mean return of the stock is 11.5%. The standard deviation of returns of the stock is 1.8%. The lower endpoint of a confidence interval for the population mean with a reliability factor of 1.5 is closest to:
A. 8.8%B. 9.7%C. 14.2%
