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问题 选择题

《经济日报》载文指出，当前以提高竞争力和控制力为重点的国有企业改革正向纵深推进，企业所有制调整实现重大突破。要以提高竞争力和控制力为重点深化国有企业改革，这是因为[ ]

A．国有经济在国民经济中必须居于垄断地位

B．各行各业都必须坚持国有经济的主体地位

C．公有制经济控制国民经济命脉，对经济发展起主导作用

D．国有经济在国民经济中起主导作用，主要体现在控制力上

答案

答案：D

单项选择题

泰山-25拖拉机的转向器是（）。

A、蜗轮蜗杆式

B、球面蜗杆滚轮式

C、螺杆螺母循环球式
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单项选择题

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 a broad 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 then defines______showing how the system win be operated, publishes the system and operations concept document, and conducts asystem concept review(SCR).
Following the SCR，the team derives______requirements for the system from the operations concept. Using structured or object-oriented analysis, the team specifies the software functions and algorithms needed to satisfy each detailedrequirement.

A．producer
B．customer
C．programmer
D．analyzer
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