归因危险度(attributable risk,AR)
参考答案:
又称特异危险度或率差,为暴露组发病率与非暴露组发病率之差,即暴露组中因为暴露于研究因素引起的发病率。
诸病胕肿,疼酸惊骇,皆属于()
A.风
B.寒
C.湿
D.火
E.热
— How is that, Mary?
— I wonder ________ it takes to be a good teacher beyond patience and a great knowledge of kids. [ ]
A. how is it that
B. what it is that
C. how it is that
D. what is it that