[名词解释] 直立性低血压

MRI颞下窝前方结构为() ["A．上颌窦后壁","B．翼内板","C．翼腭窝","D．下颌支","E．颞肌"] 脊髓损伤 在鼻腔的血液供应中，鼻腭动脉为哪一动脉的分支() ["A．眼动脉","B．筛前动脉","C．上颌动脉","D．蝶腭动脉","E．眶下动脉"] 脑血管病 测定新生儿听阈，做哪项检查最好() ["A．纯音侧听","B．耳声反射","C．声导抗","D．听性脑干电位","E．音叉检查"] 直立性低血压