大多数禾本科胚有一片瓣 状 结构通常称为外胚叶.Most grass embryos have a flap - like structure known as the epiblast.目的: 研究少汗性外胚叶发育不全引起先天缺牙的ED1基因突变.Objective : To detect ED 1 gene mutation in three hypohidrotic ectodermal dysplasia ( HED ) nuc...
It made it almost impossible for the smaller retailer to compete against the multiples.这使得小零售商几乎不可能跟连锁店竞争。Their numerical system, derived from the Babylonians, was based on multiples of the number six.他们的数制源自古巴比伦人，以数字6的倍...
The axioms adopted by Euelid mere supposed to be self - evident truths.欧几里德用的公理都应看作是不证自明的真理.The theorems should be deduced from axioms by purely logical arguments.定理应该通过纯粹的逻辑的推导而从公理演绎得到.The simplest of the substitute axi...