1. [单选题]Integration ______ is the process of verifying that the components of a system work together as described in the program design an system design specification.
A. trying
B. checking
C. testing
D. coding
2. [单选题]在电子商务的环境下，物流向集约化阶段发展，这是( )的概念。
A. 以客户为中心
B. 物流信息化
C. 物流全球性
D. 一体化配送中心
