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 software 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. patternB. models C. metadata D. components

APU启动时，如果EGT过高或转速悬挂，则（）

A、关掉BLEED AIR电门

B、关掉MASTER电门

C、释放APU灭火瓶

D、以上全正确