患者男性，有咳嗽．咳痰病史10余年，逐年加重。入冬后咳嗽明显，咳白色粘稠痰。近一周胸闷，气急，活动时加剧。嘴唇紫绀，头痛，精神软弱，有时出现神情恍惚而就医。体检：T37℃，P88次/分，R25次/分，BP110/84mmHg。桶状胸。语颤消失。叩诊过清音，心浊音界缩小，肺下界，肝浊音界下降。听诊心音遥远，肺呼吸减弱。呼气延长。

提示：红细胞压积44%，氧分压81mmHg ，二氧化碳分压53mmHg 。初步诊断考虑什么病（）

A.慢性支气管炎

B.肺心病

C.慢性呼吸衰竭

D.阻塞性肺气肿

E.慢性阻塞性肺气肿A型

F.慢性阻塞性肺气肿B型

G.慢性间质性肺病

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (6) of the technical requirements for the software product.
During the requirements definition phase, the requirements definition team uses an iterative 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 (7) that it must meet. The starting point is usually a set of high-level requirements from the (8) that describe the project or problem.
In either case, the requirements definition team formulates an overall concept for the system and then defines (9) 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 (10) 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．rules

B．principles

C．scenarios

D．scenes