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．visible
B．reliable
C．secure
D．robust

研究认为导管的连接装置可导致（）%的污染机会。

A.0.4

B.0.6

C.1

D.10

E.15