题目内容
按影响产品质量的大小与作用性质分类，可分为
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偶然因素的特点是（ ）
异常因素的特点是（）
1. _______ activities, from a positive say, can wake the children up and stimulate them. ______ activities, on the other hand can make the children calm down when they are over-excited.
2. Activities that require children to think hard are classified as “ ______ engaged activities”. Activities that require children to do things with their hands are called “______ engaged activities”.
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