下突变中哪个很少有可能产生回复突复:()
A.点突变
B.颠换
C.转换
D.染色体上三个碱基的缺失
参考答案:D
— No dessert for me, please. I'm on ____ diet.
— Why not just take one bite of ____cheese cake? I'm sure you will love it. [ ]
A. a; a
B. /; the
C. a; the
D. /; a
客车车钩中心水平线至钢轨顶面高度最小为()。
A.815mm
B.830mm
C.835mm
D.890mm