选择流行病学实验现场以下哪几点是正确的()
A.人口流动性大的因发病率高
B.人口流动性小,人口相对稳定
C.当地有较高而稳定的发病率
D.评价疫苗效果的试验应选择近期内未发生流行的地区
E.当地医疗卫生条件较差的地区
正确答案是BCD
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