问题 单项选择题

许多生产过程的动态特性是不断变化的,不能确切地描述其变化规律,而往往存在大量的扰动因素,它们的变化规律是无法预知的。能对()进行“自动”调整与修正,保证预期指标能实现的控制系统是自适应控制系统的范畴。

A.过程模型或控制规律

B.检测机构和调节器

C.调节器和执行器特性

D.模糊变量

答案

参考答案:A

填空题

语法填空。

阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填人一个适当的词

或使用括号中词语的正确形式填空。

     What is red but green, open but closed and old but new? Answer: London's new double-decker

buses. The traditional red double-deckers are    1   symbol of London. Their symbolic status was settled

in 2008 when one bus made the longer-than-usual trip to Beijing    2   (collect) a very special passenger:

the Olympic Flame.

     Now a new bus design    3   (uncover) and it has been exciting Londoners.

     The new bus uses more efficient green technology and has two staircases and an open platform,    4  

(enable) people to hop on and hop off. It also has a unique design for the front end, which gives it an

innovative (新颖的)look.

     Despite    5   innovations, the design is not all new. Its outward appearance takes after London's

faithful old double-decker, the Route master.

     In July 2008 a    6   (compete) was launched by the London Mayor, Boris Johnson, to design a new

Route master bus for the capital. There were over 700 entries, ___7___ several designers jointly winning

the ?25,000 (244,000 Yuan) prize.

     The new double-deckers, ___8___ have three doors to speed up boarding, are expected to be in

service in 2012.

     Mr. Johnson said: "This iconic new part of our transport system is not only beautiful, but also has a

green heart beating beneath its ___9___ (attract) appearance."

     He expects cities around the globe to be "beside themselves with envy" for ___10__ he described as

a "stunning red symbol" of 21st-century London.

单项选择题