What is learned in books cannot have the same deep effect _____ a child’s character as what is learned _____ experience.

A．on, in

B．on, by

C．in, by

D．by, with

按照自家企业的业态和定位明确企业经营的商品和服务的目标，在满足顾客需求过程中，确定在哪些环节形成与竞争对手的差别，形成竞争优势，这属于()。

A.差别化  

B.标准化 

C.专业化  

D.简单化