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搜题/搜资源
【单选题】【消耗次数:1】
--Hi,welcomeback!Hadanicetrip?___________________________
①
Oh,fantastic!Freshair,andsunshineeveryday.
②
Comeon,Ivegotlotsoffun.
③
Bytheway,IdontlikeSaturdays.
④
Well.I11lookforwardtoyourphonecall.
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【单选题】
-Hi, haven’t seen you for ages! You look fine! -____. You look well, too.
①
Great
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Thanks
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Oh, no
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Not at all
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-I’m sorry I broke your mirror.-Oh, really? ____.
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It’s OK with me
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It doesnt matter
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Don’t be sorry
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I don’t care
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Hi, Sam, I think you did a good jo@@
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Thank you
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Don’t mention it
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Not at all
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I did it quite badly
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Oh, I’m sorry. But I promise I’ll be careful next time.
①
It’s nothing at all
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Oh, never min
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It doesn’t matter
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Thank you
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There are no questions
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If I had had enough time, I __________ it well.
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would do
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would have done
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—I’ve got an offer in New York. —Oh, ____! But I’m going to miss you.
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That’s too bad
②
I’m sorry
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I beg your pardon
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That’s great
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【单选题】
A: Hi, Mary. Its Peter. Do you have time to talk? B: Hi, Peter, [填空]. I was just watching TV.
①
so what
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no doubt
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sure
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some time
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He as well as I ____ to go boating.
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want
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wants
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enjoy
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enjoys
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—Hi, Tory, can I use your computer for a while this afternoon?—Sorry. __________.
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Its repaired
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It has been repaired
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Its being repaired
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It had been repaired
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【多选题】
A: I think the boy can do it well.B:_________ .
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Certainly
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Sure
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I agree
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Ill do it
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同步发电机直轴电抗<imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191121/20191121093404_378.png"alt=""/>三者之间的大小关系为()。
①
<imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191121/20191121095321_129.png"alt=""/>
②
<imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191121/20191121095408_167.png"alt=""/>
③
<imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191121/20191121095350_584.png"alt=""/>
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【单选题】
E″之间的大小关系为()
①
<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205085239_210.png"/>E′E″
②
<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205083340_821.png"/>E′E″
③
<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205084116_796.png"/>E′E″
④
<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205084158_908.png"/>E′E″
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【单选题】
系统在<imgwidth="56"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image003.png">作用下的稳态误差<imgwidth="52"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image004.png">,说明()
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型别<imgwidth="38"height="20"src="../uploadfiles/word/zdkzll002.files/image005.png">;
②
系统不稳定;
③
输入幅值过大;
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闭环传递函数中有一个积分环节。
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【单选题】
系统特征方程为<imgwidth="184"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image001.png">,则系统()
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稳定;
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单位阶跃响应曲线为单调指数上升;
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临界稳定;
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右半平面闭环极点数<imgwidth="42"height="18"src="../uploadfiles/word/zdkzll002.files/image002.png">。
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【单选题】
已知系统的开环传递函数为<imgwidth="103"height="44"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image054.png">,则该系统的开环增益为()。
①
100
②
1000
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20
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不能确定
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【单选题】
若某最小相位系统的相角裕度<imgwidth="46"height="26"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image014.png">,则下列说法正确的是()。
①
不稳定;
②
只有当幅值裕度<imgwidth="46"height="28"src="../uploadfiles/word/zdkzll002.files/image015.png">时才稳定;
③
稳定;
④
不能判用相角裕度判断系统的稳定性。
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若某负反馈控制系统的开环传递函数为<imgwidth="52"height="44"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image036.png">,则该系统的闭环特征方程为()。
①
<imgwidth="74"height="22"src="../uploadfiles/word/zdkzll002.files/image037.png">
②
<imgwidth="95"height="22"src="../uploadfiles/word/zdkzll002.files/image038.png">
③
<imgwidth="92"height="22"src="../uploadfiles/word/zdkzll002.files/image039.png">
④
与是否为单位反馈系统有关
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【单选题】
开环频域性能指标中的相角裕度对应时域性能指标()。
①
超调<imgwidth="30"height="19"src="../uploadfiles/word/zdkzll002.files/image023.png">
②
稳态误差<imgwidth="29"height="24"src="../uploadfiles/word/zdkzll002.files/image024.png">
③
调整时间<imgwidth="17"height="24"src="../uploadfiles/word/zdkzll002.files/image025.png">
④
峰值时间<imgwidth="23"height="26"src="../uploadfiles/word/zdkzll002.files/image026.png">
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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">
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开环频域性能指标中的相角裕度<imgwidth="13"height="18"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image008.png">对应时域性能指标()。
①
超调<imgwidth="30"height="20"src="../uploadfiles/word/zdkzll002.files/image009.png">
②
稳态误差<imgwidth="29"height="24"src="../uploadfiles/word/zdkzll002.files/image010.png">
③
调整时间<imgwidth="17"height="24"src="../uploadfiles/word/zdkzll002.files/image011.png">
④
峰值时间<imgwidth="24"height="26"src="../uploadfiles/word/zdkzll002.files/image012.png">
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