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.

A．semantic models

B．weak entities

C．data schemas

D．business models

该患者的初步诊断是

A．风湿性心肌炎
B．贫血性心脏病
C．风心病，心力衰竭
D．先天性主动脉瓣病变
E．风湿性瓣膜病合并亚急性感染性心内膜炎