It’s required that the students__ mobile phones in their school, so seldom _ them using one.

A．not use; will you see

B．should not use; you will see

C．don’t use; will you see

D．would not use; you will see

接地电阻包括接地线电阻和接地体本身的（）。

A、电阻及流入

B、电阻及流出

C、电阻及电压

D、电流及电压