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【多选题】
关于PID控制，下列哪个说法是正确的？A.
通常，积分控制作用体现在低频段，以提高系统稳态性能 。
B.
微分控制作用体现在中频段，以改善系统的动态性能，如稳定性 。
C.
比例，可以提高系统的稳定性。
D.
除了改变比例项，无法对系统稳态控制精度进行校正 。
E.
必须要P、I、D三个部分。
F.
本质上是一种开环控制 。
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【判断题】According to speech act theory, a locutionary act is the act of uttering words, phrases and clauses. It is the act of conveying literal meaning.
A.
正确
B.
错误
【多选题】Which statements are true to the Scrapper according to the speech?
A.
they graduated from State School
B.
they have great recommendation
C.
they have fair amount of job hopping
D.
they have quite a lot of odd jobs
【单选题】Which statement is true according to the speech?
A.
Good education is very important for future of the students.
B.
Good education plays a great role on the development of the society.
C.
Good education matters to both the individuals and the society.
D.
Good education is important to find an ideal job.
【判断题】Could you please pass me the book? According to Speech Act Theory, this question is an expressive.
A.
正确
B.
错误
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