The spiral model is a software development model combining elements of both( )and prototyping-in-stages， so it’s a healthy mix of top-down and bottom-up concepts。

[单选题]The spiral model is a software development model combining elements of both(73)and prototyping-in-stages, so it's a healthy mix of top-down and bottom-up concepts。A．designB．progamC．codingD．plan

[名词解释] 模型（Model）

[单选题]The development process in the software (74) involves four phases: analysis，design,implementation, and testing.(74)A．maintenanceB．lifecycleC．programmingD．upgrading

[单选题]Relational Model表示（）。A . 关系模型B . 数据结构C . 网络D . 实体

[单选题]Data Model表示（）A . 数据模型B . 文件C . 因特网D . 记录

[单选题]Is a programming model and an associated implementation for processing and generating big data sets with a parallel, distributed algorithm on a cluster.The model is a specialization of the split-apply-combine strategy for data analysis().A．HDFSB．Chuk

[单选题]Which phase of the software development requires the most development time?A．the design phaseB．the testing phaseC．the maintenance phaseD．the development phase

[单选题] The process of software development doesn’t include（72） ．（72）A．verification functionB．writing codeC．management functionD．validation function

[单选题]The process of software development doesn't include(72)。A．verification functionB．writing codeC．management functionD．validation function

[单选题]The OS！( ) model， sometimes also called ISO or 7 layers reference model for