当前位置：在线题库搜索＞[单选题]下列哪个不是控制混杂偏倚的手段（）的答案是什么？
问题：
[单选题]下列哪个不是控制混杂偏倚的手段（）
A、限制
B、匹配
C、随机化
D、分层分析
E、研究对象有代表性
参考答案：
E
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