因素分析法
参考答案:因素分析法就是凭借预测者对现状的熟悉,运用理论和经验,比较、评估有利因素和不利因素作用的方向、程度及时间,最后对经济行情未来的变动趋势做出判断。
宇宙中的天体在不断地运动着。回答1-3题。
1.2010年春分在3月21日,秋分在9月23日,春分与秋分之间相隔几天有两种计算法。第一种是由3月21日往后推算,经4月、5月……到9月23日,有186天;第二种计算法则是由3月21日往前推算,经过2月、1月,再到前一年的12月、11月……到9月23日,共179天。地球稳定绕太阳公转,每年几乎相同,误差小于1天,而两种计算法得到的天数却相差7天,其主要原因是 [ ]
A.1月份地球公转的速度较慢
B.7月份地球自转的速度较慢
C.1月份地球公转的速度较快
D.7月份地球自转的速度较快
2.如果地球只绕日公转,不自转,地球的昼夜交替及其周期情况是[ ]
A.无昼夜交替现象
B.有昼夜交替,周期为1天
C.有昼夜交替,周期为半年
D.有昼夜交替,周期为1年
3.“月球绕地球公转的同时,自身也在自转。月球的自转周期和公转周期相等,且方向都是自西向东。”据此判断,下列正确的是[ ]
A.月球总以同一半面向着地球
B.月球无昼夜交替
C.月球昼夜温差大
D.月相有周期性变化
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. function B. definition C. specificationD. statement