生物利用度的确定应首先在什么人体内进行试验
A．健康志愿者B．关节炎C．细菌感染性疾病D．少数病人E．300例病人
参考答案：A
Which of the following statements regarding confidence intervals is TRUE（）
A. The higher the alpha level, the wider the confidence interval.
B. The relationship between the alpha level and the confidence interval cannot be ascertained.
C. The lower the alpha level, the wider the confidence interval.
如果某面点的成本率40%，那么成本毛利率和销售毛利率分别应为（）
A、30%
B、150%
C、90%
D、120%
E、60%
F、160%
