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[单选题]
下面因素中,与系统稳态误差无关的是
A.系统的类型
B.开环增益
C.输人信号
D.开环传递函数中的时间常数
A
B
C
D
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试题答案：
D
答案解释：
相关题目
系统传递函数只与___________有 关，与___________无 关。
开环传递函数的积分环节v增加，系统的稳定性（）
反馈控制系统是指系统中有（）
用系统的相位裕量即可衡量一个系统的相对稳定性。
传递函数是在零初始条件下，系统输出量的拉氏变换和引起该输出的输入量的拉氏变换之比。
振荡环节的传递函数为（）
什么是信息和信息的传递?试举例说明。
单位阶跃函数的拉氏变换是1。
拉氏变换将时间函数变换成（）
时间响应由哪两部分组成,它们的含义和作用是什么?
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1.
与胰管汇合形成肝胰壶腹的器官是( )。
2.
3.
“Why we see the lightening before we hear the thunder?” “Because light travels _______ than sound.”(1分)
4.
24. Today we remember a man who was considered one of the best teachers in the United States. Jaime Alfonso Escalante was born in 1930 in La Paz, Bolivia. Both his parents were teachers. He taught math and science in his home country for twelve years. In the 1960s, Jaime Escalante and his wife Fabiola came to the United States. During the next several years, he learned to speak English and repeated his college education and teacher training. In 1974, Mr. Escalante was hired at GarfieldHigh School to teach mathematics. The school was in a poor area of Los Angeles, California. Many of the students had serious problems with illegal drugs, gangs and violence. Many were the worst students at the school and thought to be “unteachable”. But Mr. Escalante pushed the group to work hard. He told them basic math was too easy and that they had the ability to do harder work. He told his students that he believed in them, but they must have the desire to be successful. Jaime Escalante started an advanced math program with a small group of students. Advanced Placement is a program of college-level classes and tests. In 1982, 18 of his students took the Advanced Placement test in calculus. They all passed. Officials at the testing company suspected the students of cheating. Mr. Escalante protested. He said the students were being rejected because they were Hispanic and from a poor school. He urged his students to take the test again. Twelve of the students repeated the test. And again, all of them passed. Five earned top scores. Mr. Escalante's students went on to become engineers, scientists and university professors. The advanced math program at Garfield became extremely successful over the next several years. Jaime Escalante received many teaching awards including the Presidential Medal of Excellence in Education. A movie about his success, “Stand and Deliver”, was released in nineteen eighty-eight. It influenced other teachers to use his methods.(10分)24.1 What did Mr. Escalante do after he came to the US?(2分)A. He taught math and science in a local school.B. He went to a college to learn calculus.C. He learned to speak English and got trained on teaching. D. He started an advanced math program in a college.
5.
What is the finding of Howard Friedman’s research?
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