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【多选题】
以下对三级预防的说法,正确的是( )。A.
第一级预防又称病因预防
B.
第二级预防的实施目的是防止疾病发展，降低病死率，保护健康
C.
第三级预防的实施对象是已患某些疾病的特定个人或群体
D.
第二级预防又称“三早”预防
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