试管婴儿一般于卵子受精后何时移植到宫腔()
A.4~8个细胞
B.8~16个细胞
C.32个细胞
D.64个细胞
E.128个细胞
参考答案:B
志贺氏菌属依抗原结构分为A群痢疾志贺氏菌,B群福氏志贺氏菌,C群(),D群宋内志贺氏菌。
Some historians believe that John Jay could have played () in America's history as James Madison.
A.as an important role
B.as important a role
C.an important role as
D.a role as important