下列哪项是位于提肛肌以下外科间隙的:() ["骨盆直肠间隙","直肠后间隙","坐骨直肠间隙","盆腔直肠窝","以上均是"]
根据所使用的造林材料不同,可分为哪几种造林方法?
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"]
农田防护林对树种选择主要考虑哪些?
下列对外科肛管的论述,错误的是:() ["直肠柱上缘至肛缘","齿线至肛门缘","肛管直肠环至肛缘","长4~4.5cm","长度受体位影响变化较大"]
常用的混交方法有哪些?