A:got I
B:I had got
C:had I got
D:I did get
同位素标记技术是生物学研究中常用的手段,如果仅要求标记生物细胞中的核酸,而不标记蛋白质,应标记的同位素是( )
按下列提示,写句子(至少五句)。 >
In America
In China
speak English
speak Chinese
have fast food
have Chinese food
The capital: Washington D.C.
the capital: Beijing
贝贝到超市里看到了许多水果标签,但他认为有一个标签上产地写错了,错误的是( )