【单选题】【消耗次数：1】
佝偻病活动期（激期）的主要表现是（ ）
①
突然发生惊厥
②
易激惹、夜惊
③
骨骼系统改变
④
烦躁不安、多汗
参考答案：
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相关题目
【单选题】
佝偻病的发生是由于缺乏（ ）．
①
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②
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③
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④
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随机题目
【单选题】
一名学生早上到学校主动打扫教室，被老师看到后得到老师的表扬。以后这个学生经常早到校打扫卫生。这种结果可以用( )原理来解释。
①
经典性条件反射
②
操作性条件反射
③
自我强化
④
替代强化