对齿线的论述,下列哪一项是错误的:()
A.是皮肤与粘膜的交界
B.是自主神经与脊神经的分界处
C.是胚胎时内外胚层的交界
D.是内外括约肌的分界
E.以上均不对
参考答案:D
My interests include football, bowling and surfing the web studying my favorite subjects.
A.instead of
B.as well as
C.less than
D.rather than
简述科学方法的可分为哪几个层次?