单烯烃的分子通式为()。
A.CnHn
B.CnH2n
C.CnH2n+2
D.CnH2n-2
参考答案:B
144. The reason why the two _____ cannot speak _____ language is that they were born in America and were brought up in a Japanese family.
A.Germans; German
B.Germen; the German
C.Germen; German
D.Germans; the German
面部的主要运动和感觉神经分别是
A.三叉神经和颊神经B.耳颞神经和三叉神经C.面神经和三叉神经D.面神经和颊神经E.耳颞神经和面神经