会厌前间隙
不用作尿液防腐剂的是() ["A．二甲苯","B．麝香草酚","C．甲醛","D．盐酸","E．硫酸"]
引起新生儿坏死性小肠结肠炎的病原菌主要是() ["A．革兰阳性菌","B．革兰阴性杆菌","C．革兰阴性球菌","D．厌氧菌","E．真菌"]
甲状腺显像中下列哪一种情况不呈现“冷结节”() ["A．囊肿","B．高功能腺瘤","C．腺瘤出血","D．亚急性甲状腺炎","E．腺瘤退行性变"]
诱发新生儿颅内出血的高危因素有() ["A．早产","B．围生期窒息","C．急产","D．胎头吸引器助产","E．推注高渗液体"]
喉气管中具备完整环形结构惟一的软骨是________。
