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【单选题】
流行病学研究方法包括（）A.
描述疾病在人群、时间及空间的分布
B.
病例对照研究及研究
C.
现况调查
D.
个案调查
E.
描述性研究、分析性研究、实验性研究、理论性研究
拍照语音搜题，微信中搜索"皮皮学"使用
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