从教育学的角度来研究，师生关系主要是一种（）

A、影响与被影响的关系

B、教育与被教育的关系

C、主体与客体的关系

D、权利与义务的关系

Price discrimination is most accurately defined by which of the following Price discrimination is the practice of charging different consumers different prices for:（）

A. similar products that have identical per-unit production costs.

B. products that have identical price elasticities of demand.

C. the same product or service.