经筛检后,对高血压水平的个体再检查,可预期复查者的血压值会下降属于()
A.历史性因素
B.回归因素
C.选择偏倚
D.成熟因素
E.测试因素
参考答案:B
________ that's important is that you are doing your best and moving in the right
direction.
A.One
B.All
C.Everything
D.Anything
试述安全性评价中需要注意的问题。