问题详情

According to the discussion, what forces belong to action-at-a-distance forces？ [Clink on 3 answers. ]

A．Gravitational forces.

B．Magnetic forces.

C．Frictional forces.

D．Electric forces.

E．Tensional forces.

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！