题目内容
(请给出正确答案)
[单选题]
关于两胚层embryonic disc 的描述,正确的是()
A.由胚泡滋养层细胞增殖形成
B.由外胚层和上胚层组成
C.由内胚层和下胚层组成
D.上胚层组成羊膜囊的底
E.下胚层构成羊膜囊的顶
答案
D、上胚层组成羊膜囊的底
如果结果不匹配,请 联系老师 获取答案
A.由胚泡滋养层细胞增殖形成
B.由外胚层和上胚层组成
C.由内胚层和下胚层组成
D.上胚层组成羊膜囊的底
E.下胚层构成羊膜囊的顶
D、上胚层组成羊膜囊的底
A.胚胎期(embryonic)
B.胚芽期(germinal)
C.合子期(zygotic)
D.胎儿期(fetal)
The moral shortsightedness is revealed in the fact that _____.
[A] the government has stopped the experiment on human tissue
[B] the donation consent forms are difficult to understand
[C] the Human Tissues Act is an obstacle to important medical research
[D] embryonic research shows disregard for human life