Later, in a letter to Skinner, Pressey would concede there was a massive pedagogical limitation to the device: Students learned how to master the machine, but not the subject matter.
When Bob drives along the road past the stop sign, he will eventually return to the same point at which he started. However, he would reach invisible walls, it he intended to walk along the grass, or jump to the sky. The road is the only way to get around, and it loops back on itself.，这一点在爱思助手下载最新版本中也有详细论述
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一切政绩，必须植根“实际”的土壤，遵循“规律”的准则，这是中国共产党人实事求是精神的内在要求。，这一点在WPS官方版本下载中也有详细论述
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