下列实验中，①pH试纸的使用 ②过滤 ③蒸发 ④配制一定物质的量浓度溶液，均用到的仪器是[ ]
A．蒸发皿
B．玻璃棒
C．试管
D．分液漏斗
答案：B
下列关于复利现值的说法，错误的是( )。
A．复利现值在理财计算中常见的应用包括确定现在应投入的投资金额
B．不同阶段的理财目标的价值在整合规划时可以简单相加
C．零息债券的投资价值=面值(到期还本额)×复利现值系数(n，
D．复利现值就是在给定投资期末期望获得的投资价值、一定投资报酬率和一定投资期限的条件下，以复利折现计算的投资期初所需投入金额
The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (16) 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 _( 17) that it must meet. The starting point is usually a set of high level requirements from the (18) that describe the project or problem.
In either case, the requirements definition team formulates an overall concept for the system and then defines (19) 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 (20) 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.
20（）
A.detailed
B.outlined
C.total
D.complete
