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【单选题】
佝偻病的发生由于缺乏(   ).

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【单选题】
原发性肺结核的发生由于( )

感染的细菌数量大
机体对结核菌处于过敏状态
细菌毒力较强
病人年龄较小
机体对结核菌缺乏免疫力
【单选题】
非甾体抗炎药的镇痛作用机制由于( )。

抑制前列腺素的生成
促进前列腺素的释放
阻断C纤维传导
使疼痛感受体敏感性下降
【单选题】
佝偻病的发生由于缺乏

维生A
维生素B
维生素C
维生素D
【单选题】
夜盲症可能由于缺乏( )。

维生素A
维生素D
维生素B1
维生素B2
【单选题】
窦房结的起搏活动由于

K+内流
K+递减性外流
Na+内流
Ca2+内流
B+C+D
【单选题】
传入侧支性抑制的产生由于

去极化抑制
兴奋性递质破坏过多
兴奋性递质释放减少
抑制性中间神经元兴奋
兴奋性中间神经元兴奋
【单选题】
()由于异物误入气管而引起的咳嗽。

吞咽困难
呛咳
噎食
以上都错误
【单选题】
唾液维持口腔pH值由于唾液的()

消化作用
清洁作用
缓冲作用
保护作用
稀释作用
【多选题】
某种商品的供给曲线的移动由于()。

商品价格的变化
互补品价格的变化
生产技术条件的变化
生产这种商品的成本的变化
政府向生产企业提供补贴