—When did you come to this school?
—_________ 2001. [ ]
A. On
B. At
C. In
D. From
答案:C
根据表中的已知条件,判断苏氨酸的密码子是
A.TGU
B.UGA
C.ACU
D.UCU
磨矿机的给矿器种类有()给矿器,()给矿器和()给矿器三类。