外邪侵袭人体是否发病，关键在于

A．寒温失调

B．起居不当

C．卫气之强弱

D．感邪之轻重

E．生活失节

The work that needs to be accomplished to deliver a product, service, or result with the specified features and functions is called （）.

A.scope management

B.integrated management

C.SOW

D.PMO