— I think I’ll give Bob a ring.

— You __________. You haven’t been in touch with him for ages.

A．will

B．may

C．have to

D．should

电阻制动时发电机与电动机状态的电枢电流方向（），电阻制动工况主级绕组电流与牵引工况（）。

A、一致，相反

B、一致，一致

C、相反，相反

D、相反，一致