质量检验的基本任务之一是（）。
A.生产组织出具检验人员检查能力的凭证
B.出具检测器具实用性的凭证
C.出具质量符合要求的产品检验凭证
D.出具产品使用质量状况的凭证
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APP具体操作流程为：
口腔黏膜的自身免疫性疾病是
A．白斑
B．扁平苔藓
C．慢性盘状红斑狼疮
D．复发性坏死性黏膜腺周围炎
E．肉芽肿性唇炎
混合性呼吸困难最常见于（）。
A.大叶性肺炎
B.气管异物
C.肺气肿
D.支气管哮喘
E.重症肺炎
The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable（1） 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（2） that it must meet. The starting point is usually a set of high-level requirements from the（3）that describe the project or problem.
In either case, the requirements definition team formulates an overall concept for the system and the defines （4）showing how the system will be operated, publishes the system and operation concept documents, and conducts a system concept review (SCR).
Following the SCR, the team derives （5） requirements for the system from the highlevel requirements and the system operations concept. Using structured or object-oriented analysis,the team specifies the software functions and algorithms needed to satisfy each detailed requirements.
（2）处填（）
A. criterion
B. standard
C. model
D. system
疲劳时吃维生素的作用。
简述地图符号的分类。