____ , people in the north have noodles as their main food while thesoutherners are fond of rice in China.    [ ]

A. In common  

B. In general  

C. In total  

D. In return

蓄电池放电终了的特征是（）。

A、单格电压下降到终止电压1、75V

B、不再有电

C、电解液密度降到1、10g/cm3

D、蓄电池不能继续使用