25-OH-D3经何种酶羟化形成1，25-（OH）2-D3（） ["7α-羟化酶","1α-羟化酶","25α-羟化酶","1γ-羟化酶","7γ-羟化酶"]
先天性主动脉瓣异常可分为四种畸形，下列哪项是错误的（） ["单瓣","二瓣","三瓣","四瓣","六瓣"]
关于钩虫的病原学，下列哪项是正确的（） ["杆状蚴需两次蜕皮发育为具有感染力的丝状蚴","丝状蚴与杆状蚴均具有感染力","寄生于人体的钩虫仅有十二指肠钩口线虫","杆状蚴为感染期幼虫","虫卵先发育为丝状蚴再发育成杆状蚴"]
吗啡的适应证为（） ["颅脑外伤疼痛","诊断未明急腹症疼痛","哺乳期妇女镇痛","分娩镇痛","急性严重创伤、烧伤所致疼痛"]
对一个爱发脾气、容易哭闹的孩子，父母可以通过减少对孩子这一行为的关注来降低该行为，这一机制行为主义称之为（） ["消极强化","积极强化","消极惩罚","系统脱敏","消退"]
电气着火如何急救？
