圬工桥面制作保护层时，桥面纵向应每隔（）设一断缝。A、4m B、5m C、6m D、

在某些情况下，计算期不同的各互斥方案之间的效益基本相同或具有相同的效用，但其效益却很难量化，这时可用（）进行方案比选。

A.净现值法

B.费用年值法

C.净现值率法

D.年值法

A great number of reporters were sent there to________ the newest situation of the area.      [ ]

A. cover                        

B. reporting      

C. be covering                    

D. reported

ISO9000族标准与TQC的差别在于；ISO9000族标准是从( )立场上所规定的质量保证。

A．设计者

B．采购者

C．供应者

D．操作者

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable ______ of the technical requirements for the software product．
During the requirements definition phase, the requirements definition team uses an iterative process to expand abroad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each ______ that it must meet．The starting point is usually a set of high-level requirements from the ______ that describe the project or problem．
In either case, the requirements definition team formulates an overall concept for the system and the defines ______ 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 ______ requirements for the system from the high-level 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．rules
B．principles
C．scenarios
D．scenes