9号道岔的侧向允许通过速度为（）km/h。

A、25 

B、30 

C、20 

D、35

The software architecture of a program or computing system is the structure or structures of the system, which comprise software______, the externally ______ properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a ______ that enables a so, ware engineer to: analyze the ______ of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the ______ associated with the construction of the software.

A．quality
B．budget
C．schedules
D．risks