根据产业类型的不同，物流成本分为（）。

A.流通企业物流成本

B.生产企业物流成本

C.纯粹性流通成本

D.消费物流成本

E.废弃物流成本

Originally, the World-Wide Web was designed as information medium for (71) research teams. A deliberately simple implementation model was chosen to make it as simple as possible for authors to (72) documents to the web, and to (73) these in the sense of updating content. This implementation model is centered around the notion of resources, usually file-base D. For the (74) intended use of the web, resources presented a useful abstraction, as they related to relatively self-contained chunks of information such as research publications and (75) pages. Such chunks of information typically could be set up and maintained independently of other resources, so that resources were the appropriate abstraction for composition and modification.

（72）（）

A.contribute

B.write

C.hand

D.make