在胸腔内,由浆膜围成的囊腔共计有() ["A.1个","B.2个","C.3个","D.4个","E.5个"]
气管切开时,不涉及的结构是() ["A.皮肤,浅筋膜","B.颈深筋膜浅层","C.胸骨上间隙及内容","D.椎前筋膜","E.舌骨下肌群和气管前筋膜"]
肺下界在肩胛线上平对() ["A.第6肋","B.第8肋","C.第10肋","D.第11肋","E.第12肋"]
对环状软骨的描述,不正确的是() ["A.有致密的结缔组织和肌肉与甲状软骨相连","B.位于甲状软骨下方","C.为喉与气管、咽与食管的分界标志","D.可作计数气管环的标志","E.平对第5颈椎横突"]
妊娠心脏病患者中,不属早期心衰的体征是() ["A.休息时心率大于110次/分","B.休息时呼吸大于20次/分","C.肝脾大,有压痛","D.阵发性夜间呼吸困难","E.肺底部出现少量持续性湿啰音,咳嗽后不消失"]
交换节点的主要功能是什么?