高原病的主要病因为() ["A．大气压的下降增加了氧分压","B．大气压的升高增加了氧分压","C．升高的大气压降低了氧分压","D．大气压的下降减低了氧分压","E．以上都不对"]
下列关于骶椎麻醉的描述中，正确的是() ["A．硬膜外麻醉","B．又名鞍区阻滞","C．适用于直肠、肛门会阴部手术","D．不易发生局部麻醉药物中毒","E．容易发生马尾综合征"]
下列哪一项是结核性腹膜炎的最常见的并发症： ["A、肠穿孔","B、肠瘘","C、肠梗阻","D、肠结核","E、腹腔脓肿"]
轻度冻僵()中度冻僵()重度冻僵发病机制() ["A．热储备机制丧失","B．寒战产生热量","C．体温调节机制衰竭","D．严重缺氧","E．散热增加"]
胃癌最好发的部位是： ["A、胃体部","B、胃贲门部","C、胃窦部","D、胃底部","E、胃大弯部"]
常发生心室颤动()出现僵死样面容()明显肌肉震颤()
