下列币种中,通常采取直接标价法的是()。
A.英镑
B.日元
C.新加坡元
D.澳大利亚元
参考答案:B
We believe that Mary ________ take the money at that time, though she was poor. [ ]
A. won't
B. wouldn't
C. is not going to
DNA变性时双螺旋松解,在260nm波长处紫外吸收OD值增加是()
A.融解温度Tm
B.增色效应
C.减色效应
D.DNA复性
E.核酸分子杂交