The first problem that the system faces: as IRT theory model is imposed severer basic assumptions, so large groups of samples are needed to build the Item bank.
本系统解决的第一个问题是：IRT理论模型有较严苛的基本假设，因此需要建设大样本配合的题库。
Selects 21 groups of two-syllabic as the basic investigation model.
选取21组二字组为基本调查模型。
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