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问题 解答题

（1）对于式子|x|+13，当x等于什么值时，有最小值？最小值是多少？  

（2）对于式子2-|x|，当x等于什么值时，有最大值？最大值是多少？

答案

解：因为不论x取任意有理数，都有|x|≥0，所以：

（1）当x=0时，有最小值，最小值为13；

（2）当x=0时，有最大值，最大值为2。

单项选择题

The Rational Unified Process (RUP) is a software engineering process, which captures many of best practices in modern software development. The notions of (21) and scenarios have been proven to be an excellent way to capture function requirements. RUP can be described in two dimensions - time and content. In the time dimension, the software lifecycle is broken into cycles. Each cycle is divided into four consecutive (22) which is concluded with a well-defined (23) and can be further broken down into (24) - a complete development loop resulting in a release of an executable product, a subset of the final product under development, which grows incrementally to become the final system. The content structure refers to the disciplines, which group (25) logically by nature.

24（）

A.rounds

B.loops

C.iterations

D.circularities
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单项选择题

发动机推力调定通过控制发动机压力比（EPR），以下说法哪种正确（）

A.发动机压力比（EPR）=低压涡轮排气压力（P5）/发动机进气道压力（P2）

B.EPR方式是控制推力的正常方式，N1方式为EPR失去传感时的方式，通过控制燃油流量调定所需的EPR方式

C.以上都对
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