儿童呼吸衰竭的定义是在不吸氧的情况下 ["A．PaO2＜60mmHg或PaCO2＞50mmHg","B．PaO2＜50mmHg或PaCO2＞50mmHg","C．PaO2＜60mmHg或PaCO2＞60mmHg","D．PaO2＜70mmHg或PaCO2＞50mmHg","E．PaO2＜70mmHg或PaCO2＞60mmHg"] 进行胸外按压时正确的位置是 ["A．胸骨中下1／3交界处","B．胸骨中1／3交界处","C．胸骨中上1／3交界处","D．胸骨左缘心尖部","E．胸骨与两乳头连线处"] 直接促进1，25(OH)D生成的因素是 ["A．高血磷","B．低血磷","C．高血钙","D．降钙素","E．以上都不是"] 单纯以谷类喂养的人工喂养儿如不及时添加水果、蔬菜即可造成 ["A．维生素A缺乏","B．维生素B1缺乏","C．维生素C缺乏","D．维生素D缺乏","E．维生素E缺乏"] 正常婴儿每日维生素A、维生素B维生素C供给量为 ["A．200μg、0．4mg、40mg","B．200μg、0．4mg、30mg","C．500μg、0．6mg、30mg","D．500μg、0．6mg、40mg","E．300μg、0．2mg、40mg"] 在维生素D的代谢中，何者活性最强