以下哪一项是由自主神经支配的:() ["外括约肌皮下环","外括约肌浅环","外括约肌深环","提肛肌","以上均不是"]
关于肛门内括约肌的论述,下列哪一项是错误的:() ["起着括约肛门的作用","受自主神经支配","是直肠环状肌在肛管上部的肥大部分","长度约3cm","很容易暴露于手术切口处"]
下列哪一个间隙发生感染,容易出现"蹄铁形"脓肿:() ["坐骨直肠间隙","直肠后间隙","骨盆直肠间隙","肛门后浅间隙","肛门后深间隙"]
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?
根据所使用的造林材料不同,可分为哪几种造林方法?