介绍杭州西湖时，先从其概况、传说、成因讲起，继而讲解湖中景物。这种讲解方法称为（）。

奥运盈利不只包括奥运本身的成功，还要考虑到一个国家举办奥运其他的产业经济发展情况。2008年奥运会对于北京经济的影响可以说是广泛且深远的。除了与赛事最直接相关的场馆建设、市政基础设施投入、旅游消费、体育产业等方面的巨大商机之外，更为中国和北京提供了一个向世界展示的巨大舞台。随着世界越来越多地了解中国、了解北京，很多潜在的商机就会浮出水面并接踵而来。这段话主要支持这样一个观点，即( )。

A．举办奥运会的城市可借奥运实现盈利

B．奥运会可以带动多项产业经济的发展

C．中国应该抓住奥运这个舞台展示自己

D．奥运处处是商机，北京将会空前发展

由于业主的原因导致承包商租赁的设备窝工，该窝工费应按照（）计算。

A.台班费

B.台班折旧费

C.实际租金

D.设备使用费

脱丙烷塔温控阀供风管堵死以后，外操可以发现该控制阀（）。

A、全开

B、全关

C、不规则运动

D、维持原来阀位

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.

17（）

A.criterion

B.standard

C.model

D.system

VRRP中只定义了一种报文-VRRP报文，这是一种（）报文。

A.单播

B.广播

C.组播

D.hello