下列现象,属于光的色散现象的是
A.小孔成像
B.水中月亮
C.雨后彩虹
D.海市蜃楼
答案:C
小孔成像属于光的直线传播;水中的月亮属于光的反射;海市蜃楼属于光的折射。选C。
汇入下腔静脉()
A.子宫静脉
B.右卵巢静脉
C.左卵巢静脉
D.子宫动脉
E.卵巢动脉
The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (46) 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 (47) that it must meet. The starting point is usually a set of high-level requirements from the (48) that describe the project or problem. In either case, the requirements definition team formulates an overall concept for the system and then defines (49) 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 (50) 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.detailed
B.outlined
C.total
D.complete