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【多选题】
社会调查方法中的实验法和观察法根本不同在于( )。
A.
实验的观察不是自然状态下的观察，而是在人工环境中，在人为控制中进行的观察
B.
实验研究者靠自己的感受去搜集对象的信息
C.
自然观察的内容是难以重复的，而实验的内容却可以不断反复
D.
实验的内容是难以重复的
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