... 二点分布；二点分配 two-point distribution 二样本实验 two-sample experiments 二样本位置族群 two-sample location family ...
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Two teaching experiments were conducted and a big-sample questionnaire was carried out to test its efficiency.
在实践中进行了两次教学实验，同时进行了大样本的问卷调查，检验其效度。
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