题型:选择题 about this computer program, a huge amount of time and energy .A.Should I know; be savedB.If I had known; can be savedC.Had I known; would have been savedD.Did I know; was saved 查看答案
题型:单项选择题 下面对核仁的叙述,哪项正确?()A.核仁是细胞核内由膜包围的结构B.有丝分裂期核仁的消失与核糖体合成的停止有关C.核仁DNA编码tRNA基因D.1个核仁相当于1个核仁组织区E.以上叙述均不正确 查看答案