— Are you going to buy ___________ books?
— Yes, I am. [ ]
A. a
B. some
C. any
答案:C
16,27,16,( ),1
A.5B.6C.7D.8
采用双层绕组的直流电机绕组元件数与换向片的数相比( )。
A.多一倍
B.少一倍
C.少一片
D.相等