治疗筋脉挛急疼痛的药物,大多是何味药() ["酸","苦","甘","辛","咸"]
下列哪项不是水平传播方式() ["空气传播","经水传播","经胎盘传播","经食物传播","经媒介节肢动物传播"]
胎儿血液循环中,血氧饱和度最高的部位是() ["左心房","左心室","主动脉","脐动脉","脐静脉"]
食品从业人员应多长时间进行一次健康体检() ["半年一次","一年一次","两年一次","三年一次","只需上岗前检查"]
影响地表水水质的最主要因素是() ["气象条件 ","流量 ","季节 ","自然灾害 ","未处理的生活污水或工业废水"]
幼儿急疹发热期无特殊体征,典型的表现为______。