【单选题】【消耗次数：1】
已知单位反馈系统的开环传递函数为，当输入信号是时，系统的稳态误差是（）
①
0
②
∞
③
10
④
20
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相关题目
【单选题】
非单位负反馈系统，其前向通道传递函数为G(S)，反馈通道传递函数为H(S)，当输入信号为R(S)，则从输入端定义的误差E(S)为()
①
<imgwidth="126"height="22"src="../uploadfiles/word/zdkzll002.files/image040.png">
②
<imgwidth="169"height="22"src="../uploadfiles/word/zdkzll002.files/image041.png">
③
<imgwidth="176"height="22"src="../uploadfiles/word/zdkzll002.files/image042.png">
④
<imgwidth="168"height="22"src="../uploadfiles/word/zdkzll002.files/image043.png">
【单选题】
已知单位反馈系统的开环传递函数为<imgwidth="159"height="44"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image061.png">，当输入信号是<imgwidth="104"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image062.png">时，系统的稳态误差是（）
①
0
②
∞
③
10
④
20
【单选题】
已知下列负反馈系统的开环传递函数，应画零度根轨迹的是（）。
①
<imgwidth="67"height="47"src="../uploadfiles/word/zdkzll002.files/image044.png">
②
<imgwidth="93"height="47"src="../uploadfiles/word/zdkzll002.files/image045.png">
③
<imgwidth="86"height="47"src="../uploadfiles/word/zdkzll002.files/image046.png">
④
<imgwidth="65"height="47"src="../uploadfiles/word/zdkzll002.files/image047.png">
【单选题】
已知单位反馈系统的开环传递函数为<imgwidth="159"height="44"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image048.png">，当输入信号是<imgwidth="104"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image049.png">时，系统的稳态误差是（）
①
0；
②
∞；
③
10；
④
20
随机题目
【单选题】
What are two grammar practice activities?
①
Mechanical practice and meaningful practice
②
Volume practice and communicative practice
③
Interest practice and meaningful practice
④
Mechanical practice and success oriented practice.
【单选题】
What are two broad categories of knowledge?
①
Implicit knowledge and explicit knowledge
②
Obvious knowledge and unobvious knowledge
③
Inductive knowledge and deductive knowledge
④
Refereed knowledge and inferred knowledge.
【单选题】
Which of the following steps are typical for the deductive grammar teaching method?
①
Give examples→explain rules→students do practice activities
②
Authentic language data is provided→induces learners to realize grammar rules→apply the new structure to produce sentences (the inductive method)
③
Explicit rules are give to students→Authentic language data is provided→apply the new structure to produce sentences (the guided discovery method)
④
All of the above.
【单选题】
Which of the following statement is not true?
①
Grammatical competence is essential for communication
②
There is a positive role of instruction for grammar learning
③
Grammar teaching can enhance learner proficiency
④
Grammar learning is completely useless for children.
【单选题】
Which of the following is not grammar presentation method?
①
Deductive method
②
Inductive method
③
Guided discovery method
④
Communicative teaching method.
【单选题】
What is the realistic goal of teaching pronunciation?
①
Consistency
②
Intellegibility
③
Communicative efficiency
④
All of the above.
【单选题】
Which type does the following production practice belong to? She sells sea shells on the seashore.
①
Make up sentences
②
Using meaningful context
③
Using pictures
④
Using tongue twisters.
【单选题】
Which type does the following production practice belong to? The students repeat what the teacher says. This activity can practice individual sounds, individual words, groups of words, and sentences.
①
Listen and repeat
②
Fill in the blanks
③
Make up sentences
④
Using meaningful context
【单选题】
What does the falling intonation on the question “where do you live ?” indicate?
①
I am telling you something you do not know
②
I have not finished yet
③
I am asking a genuine question
④
I know you have told me before.
【单选题】
What is reflected as important in the following example? A. Would you please turn down the radio a little bit? B. Sorry. ↘ （no, I do not want to.） Or B. Sorry? ↗ （what did you say?）
①
Stress
②
Intonation
③
Sounds
④
Pitch Part