对齿线的论述,下列哪一项是错误的:() ["是皮肤与粘膜的交界","是自主神经与脊神经的分界处","是胚胎时内外胚层的交界","是内外括约肌的分界","以上均不对"]
从肛管直肠环至肛缘称为:() ["栉膜带","直肠柱","解剖肛管","外科肛管","直肠壶腹"]
常用的混交方法有哪些?
在以下何处有痔上动脉的终末支及伴随的静脉丛:() ["截石位2、5、9点","截石位5、9、11点","截石位3、7、11点","截石位2、7、9点","截石位3、9、11点"]
行直肠脱垂注射术时,为防止刺破腹膜,进针应小于:() ["4cm","5cm","6cm","8cm","10cm"]
农田防护林对树种选择主要考虑哪些?