In many industries, consumers return products for warranty repair, replacement, or recycling. （）will become more important as customers demand more flexible and favorable return policies.

A.Parts service

B.Reverse distribution

C.Reverse transportation

D.International logistics

RAT的能量源于：（）.

A、发动机气源

B、液压

C、冲压空气

D、电瓶或静变流机