胎儿时期有________根脐静脉，_________根脐动脉。
下列哪项无肺内多发空洞() ["A．肺结核","B．肺泡细胞癌","C．转移性肺癌","D．肺吸虫病","E．韦格肉芽肿"]
阿托品的基本药理作用有() ["A．解除平滑肌痉挛，缓解内脏绞痛","B．阻断虹膜括约肌和睫状肌的M受体，导致扩瞳","C．刺激腺体分泌","D．减慢房室传导，减慢心率","E．解除小血管痉挛，改善微循环"]
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"]
胎儿时期，脐静脉中流动的是______血，脐动脉中流动的是__________血。
