卵细胞作为生殖细胞,在生物技术中一般不用于[ ]
A.植物组织培养形成试管苗
B.进行体外受精培育试管动物
C.克隆动物时细胞核的受体
D.形成受精卵培育转基因动物
答案:A
Evidence collected by the spacecraft on Mars shows some present volcanic action, though the volcanoes are believed to be dormant if not dead.
A.deceased
B.departed
C.disappeared
D.extinct
吸收剂量、比释动能两者之间的联系和区别?