A data warehouse is a subject-oriented data set used for reporting and analusis. Data warehouses can be subdivided into ( ). Which store subsets of data from a warehouse.

A. OLTPs

B. transactions

C. data sarts

D. OLAPs

最常规的一种车辆运行方式是（）。

A.不定线、不定站式

B.定线定站的运行方式

C.定线、不定站式

D.不定线、定站式