He slipped and had his leg broken. _____, he will have    to be away from school for two

or three months.      [ ]

A. In any case                    

B. After all    

C. As a result                  

D. In this way

三相异步电动机的定子主要由（）组成。

A、铁芯

B、定子绕组

C、端盖

D、机座