【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】
研究某种新药的降压效果,对100人进行试验,其显效率的95%可信区间为0.862～0.926,表示（ E ）
①
样本显效率在0.862～0.926之间的概率是95%
②
有95%的把握说总体显效率在此范围内波动
③
有95%的患者显效率在此范围
④
该区间包括总体显效率，可信度为95%
【单选题】
调查某疫苗在儿童中接种后的预防效果，在某地全部1000名易感儿童中进行接种，经一定时间后从中随机抽取300名儿童做效果测定，得阳性人数228名。若要研究该疫苗在该地儿童中的接种效果，则（ ）
①
该研究的样本是1000名易感儿童
②
该研究的样本是228名阳性儿
③
该研究的总体是300名易感儿童
④
该研究的总体是1000名易感儿童