The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (36) of the technical requirements for the software product.
During the requirements definition phase, the requirements definition team uses an interative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each (37) that it must meet. The starting point is usually a set of high level requirements from the (38) that describe the project or problem.
In either case, the requirements definition team formulates an overall concept for ’the system and then defines (39) showing how the system will be operated, publishes the system and operations concept document and conducts a system concept review (SCR) .
Following the SCR, the team derives (40) requirements for the system from the high level requirements and the system and operations concept using structured or object-oriented analysis. The team specifies the software functions and algorithms needed to satisfy each detailed requirement.

A．criterion

B．standard

C．model

D．system

男性患者，52岁，爬山时突发眩晕、呕吐、行走不稳，很快昏迷，呼吸不规则；CT显示为小脑出血，血肿20ml。首选治疗及采取的措施是（）

A.大剂量止血药

B.呼吸兴奋剂

C.应用呼吸机

D.20%甘露醇250-500ml静脉滴注

E.立即手术治疗