单选题 An architectural Style defines as a family of such systems in terms of a (71) 、of structural organization.More specifically an architectural style defines a vocabulary of
(72) and connector types, and a set of (73) on how they can be combined. For many styles there may also exist one or more (74) that specify how to determine a system's overall properties from the properties of its parts. Many of architectural styles have been developed over the years.The best-known examples of (75) architectures are programs written in the Unix shell．

单选题 A．pattern B．data flow
C．business process D．position level

单选题 A．metadata B．components
C．models D．entities

单选题 A．functions B．code segments
C．interfaces D．constraints

单选题 A．semantic models B．weak entities
C．data schemas D．business models

单选题 A．event-based B．object-oriented
C．pipe-and-filter D．layered