最易出现空洞内液平的病变是() ["A．肺结核","B．急性肺脓肿","C．慢性纤维空洞型肺结核","D．肺癌","E．肺囊肿合并感染"]
促胃液素的生理作用有() ["A．刺激胃黏膜细胞增殖","B．刺激壁细胞分泌盐酸","C．抑制主细胞分泌胃蛋白酶原","D．刺激胰液、胆汁和肠液分泌","E．刺激幽门与回音括约肌收缩 "]
下列关于肺气肿的描述，不正确的是() ["A．上叶肺血增加","B．可有肺大泡","C．胸片正常就可除外肺气肿","D．膈顶变平","E．少数正常人也可出现肺气肿类似表现"]
下述哪一类水、电解质紊乱早期就易发生循环衰竭() ["A．高渗性脱水","B．等渗性脱水","C．低渗性脱水","D．水中毒","E．低钾血症"]
卵圆孔瓣膜到生后_______形成解剖上关闭。
正常胎儿血循环中血氧饱和度最高的部位是___________
