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【简答题】
已知最小相位系统的开环对数幅频特性 和串联校正装置的对数幅频特性 如下图所示,原系统的幅值穿越频率为 /s 1、 写出原系统的开环传递函数 , 并求其相角 ,判断系统的稳定性; 2、 写出校正装置的传递函数 ; 3、写出校正后的开环传递函数 ,画出校正后系统的开环对数幅频特性 ,并判断系统的稳定性。 4、说明该校正装置属于超前还是滞后校正,分析增加校正装置对系统性能的影响。
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举一反三
【单选题】(Para 1) What do college students today want desperately? Which one is not mentioned?
A.
Doing unusual and remarkable
B.
Living a meaningful life
C.
Changing the world
D.
A life of goodness
【简答题】What is the modern college campus change greatly?(Para.1)
【单选题】In Para. 3, it is implied that ______.
A.
the Land-Grant College Act was passed in 1862
B.
women had no rights to get higher education before 1862
C.
each state should support one public college
D.
federal land was allowed to be sold by state government
【单选题】What does the author mean by kids count more than their college Line1,para.4?
A.
Continuing education is more important to a person success.
B.
A person happiness should be valued more than their education.
C.
Kids actual abilities are more important than their college background.
D.
What kids learn at college cannot keep up with job market requirements.
【单选题】According to the author, what's the general consensus in terms of college education? (Para. 1)
A.
It costs too much to attend a college or university.
B.
College helps students earn more money.
C.
All high school graduates ought to go to college.
D.
It's time to look at the value of college education.
【简答题】股票是反映的代表持有者对股份公司的________,的一种出资证明
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