关于债券投资收益的说法下列错误的是（）。

A.债券投资的收益一般通过债券收益率进行衡量和比较

B.到期收益率，又称票面收益率，是票面利息与面值的比率

C.名义收益率一般仅供计算债券应付利息时使用

D.名义收益率是投资购买债券的内部收益率

E.持有期收益率，是债券买卖价格差价加上利息收入后与购买价格之间的比率

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (87) 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 (88) that it must meet. The starting point is usually a set of high-level requirements from the (89) that describe the project or problem.
In either case, the requirements definition team formulates an overall concept for the system and the defines (90) 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 (91) 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.

A. rules B. principles
C. scenariosD. scenes