1. [多选题]when the system upon which a transport entity is running fails and subsequently reatarts,the()information of all active connections is lost.the affected connections become half-open,as the side that did not fail does not yet realize the promble. The still active side of a half-open connections using a()timer.this timer measures the time transport machine will continue to await an()of a transmitted segment after the segment has been retransmitted the maximum number of times.when the timer(),the transport entity assumes that either the other transport entity or the intervening network has failed.as a result,the timer closes the connection,and signals an abnormal close to the TS user. In the event that a transport entity fails and quickly restart,half-open connections can be teminated more quickly by the use of the RST segment.the failed side returns an RST I to every segment I that it receives.when the RST I reaches the other side,it must be checked for validity dased on the ()number I,as the RST could be in response to an old segment .if the reset is valid,the transport entity performs an abnormal termination.
A. data
B. state
C. signal
D. control
2. [单选题]以下关于大型及复杂项目的描述中,错误的是__________。
A. 通常由专业的咨询公司对需求进行详细的定义
B. 获取需求的咨询公司在需求实现阶段是项
C. El监理的角色
D. 大型及复杂IT项目往往在需求不十分清晰的情况下开始
E. 在需求实现阶段要求对业务领域有深刻的理解
3. [单选题]最近几年,外科医生数量的增长超过了外科手术数量的增长,而许多原来必须进行的外科手术现在又可以代之以内科治疗,这样,最近几年,每个外科医生每年所做的手术的数量平均下降了四分之一。如果这种趋势得不到扭转,那么,外科手术的普遍质量和水平不可避免(inevitable)地会降低。上述论证基于以下哪项假设?
A. 除非每年所做手术的数量不低于一个起码的标准,否则一个外科医生不可能(impossible)保持他的手术水平。
B. 新上任的外科医生的手术水平普遍低于已在任的外科医生。
C. 最近几年,外科手术的数量逐年减少。
D. 最近几年,外科手术的平均质量和水平下降了。
4. [单选题]项目管理师(superviser for project management)为了准备WBS,需要做的第一步(first step)应该是(12)。
A. 确定每个项目阶段的估计成本和时间
B. 确定主要的项目可交付事项
C. 确定每个项目阶段的组成部分
D. 确定要完成的关键工作
5. [单选题]● 在软件需求工程中,需求管理贯穿整个过程。需求管理最基本的任务是明确需求,并使项目团队和用户达成共识,即建立(19)。(19)
A. 需求跟踪说明
B. 需求变更管理文档
C. 需求分析计划
D. 需求基线