题目内容
混杂变量必须与下列哪些因素有关
2022-01-04
A.与暴露因素有关，与疾病无关
B.与疾病无关，与暴露因素无关
C.与病例有关，与对照无关
D.与暴露有关，与外暴露无关
E.与疾病和暴露因素都有关
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