属于甲类传染病的疾病是() ["艾滋病","流行性乙型脑炎","麻疹","鼠疫","狂犬病"]
复诊产前检查不包括()。 ["测血压","测体重","听胎心音","尿常规检查","B超了解胎儿大小"]
什么叫柔性轴?
下列关于使用棉絮钡餐诊断食道异物不正确的是() ["A.结合常规透视摄片,絮钡可有利于检出透光或密度较低的异物
","B.异物较大,怀疑伴发食道炎症者,可使用稀钡
","C.消毒棉撕成薄片网状,浸泡在黏稠钡剂中
","D.无钡棉钩挂现象,也不能完全排除异物存留
E.絮钡可掩盖异物外形,加重阻塞,增加食管镜检的困难"]
组织兴奋性高则() ["阈电位高","阈值低","反应性降低","刺激性增加","动作电位的幅值降低"]
什么是刚性轴?