问题 问答题 简答题

说明串级调节系统的工作原理及特点,并结合主蒸汽温度调节系统画出串级调节系统的简单框图。

答案

参考答案:

当调节对象的迟延和惯性较大时,工艺上对调节质量要求又较高,可以考虑采用串级调节系统。串级调节系统有两个闭环回路由副调节器及对象的导前区形成的闭环为副环或内环,由主调节器及对象惰性区及副环形成的回路称为主环或外回路,工作是来自主调节器的输出作为副调节器的给定值,而由于导前区的迟延和惯性较小,适当整定副调节器可以及时消除来自导前区的干扰,保证了主环的调节质量。

阅读理解

Ma Weidu is the founder and curator(馆长)of Guanfu Museum, which is the first private  museum in China. With mainly Chinese artifacts on exhibition, the museum was founded on Jan. 18,l 997.It was not well-known by the public until 2008.

On Jan. l,2008,Ma Weidu was invited to be the guest in the flagship CCTV program “Lecture Room”. He talked about his museum and more importantly, he introduced Chinese artifacts and their underlying historical, cultural significance.

In 2009,Ma Weidu initiated Beijing Guanfu Cultural Foundation. Creating a culture foundation had been Ma’s dream for many years. Beijing Guanfu Cultural Foundation is committed to spreading Chinese traditional culture, funding the development of Guanfu Museum, heritage research and conservation projects, building a platform for public culture, promoting and guiding the public in the spirit of “charity&culture sponsorship(赞助)”.

Guanfu Museum is currently located at No.18 Jinnan Road, Zhangwanfen, Dashanzi, Chaoyang district, Beijing. But due to the city planning, it has to move. Guanfu Museum, which has experienced relocation for three times, is now looking for a new place. According to Mr. Ma, it should be around 20,000-30,000 square meters.

小题1:According to this passage, which of the followings is true?

A.Guanfu Museum was built in 2008.

B.Ma Weidu was invited to lecture by Guanfu Museum.

C.The public were attracted by Chinese artifacts on exhibition.

D.Guanfu Museum, the first private museum in China was founded fifteen years ago.小题2:Guanfu Museum, according to the city government,_______ .

A.will be painted

B.has to hold a new exhibition

C.has to move to a new place

D.has to be enlarged小题3:The proper title of this passage should be_____.

A.Ma and His Museum

B.Museums

C.Culture Relics

D.Chinese Culture

单项选择题