【单选题】【消耗次数：1】
A: I missed yesterdays basketball final. B: [填空]
①
What a pity!
②
Its a good idea.
③
Remember to bring it next time.
④
Im glad to hear that.
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相关题目
【单选题】
A: I didnt know you play basketball. Are you having fun? B: Im having a great time. [填空] What are you doing?
①
Great!
②
How about you?
③
I miss it so much
④
Do you know billiards?
【单选题】
A: Im having a barbecue next Saturday. [填空]. B: Sure. That would be wonderful. What time?
①
I have invited some of my friends to come
②
Will you be free at that time?
③
Im looking forward to it
④
I was wondering if youd like to come
【单选题】
A: Hi, Mark, Im glad you could come. B: [填空] A: No, you are right on time.
①
Its my great honor, thanks.
②
You are welcome. Am I the first?
③
Thanks. Do you have the time?
④
I hope Im not too late.
【单选题】
A: Richard, class begins at 9, and you are late. B: I know, but I missed my bus, Im sorry. B: [填空]. You have to be here on time.
①
Thats no excuse
②
Dont mention it
③
You neednt be
④
No problem
【单选题】
A: Hi. My name is David Manning. Im from Britain. B: Im Bill Clinton. Glad to meet you. What year are you? A: [填空].
①
Im a first-year student
②
I was born in 1990
③
Ive been here for years
④
Im 19 years old
【单选题】
— Oh, Im sorry. But I promise Ill be more careful next time.— _______________________.
①
Its nothing
②
Oh, never mind. It doesnt matter
③
Thank you
④
There are no questions
【单选题】
A: Its getting late. Im afraid I must be going now. B: Ok. [填空].
①
See you
②
Take it easy
③
Go slowly
④
Stay long
【单选题】
Our old school_______ demolished next month. What a pity!
①
will be
②
is being
③
has been
随机题目
【单选题】
8-10 在计算图示电路过渡过程中的i，uR，uC时，所使用的时间常数<img class=jc-formula data-tex=\tau src=https://huaweicloudobs.ahjxjy.cn/2CD7B56839A80551EEDD7D4015B0FE37.png style=vertical-align: middle;/>值 。<img src=https://huaweicloudobs.ahjxjy.cn/533B194886C822B26C8AF2D9184B1BC8.jpg title=8-10.jpg alt=8-10.jpg/>
①
是相同的，均为RC
②
是相同的，均为C/R
③
是相同的，均为R/C
④
是不同的
【单选题】
8-5 图示电路在t=0时开关由1打向2，此前为稳态。则换路后电容电压uc(t)= 。<img src=https://huaweicloudobs.ahjxjy.cn/E423FFD24B1E13528DDAA6F4B711A3D2.jpg title=Image00037.jpg alt=Image00037.jpg/>
①
<img class=jc-formula data-tex={ u }_{ C }(t)=10{ e }^{ -2t }V src=https://huaweicloudobs.ahjxjy.cn/AEB3C1C35AA2D6C241E3ED6216DF1840.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex={ u }_{ C }(t)=2{ e }^{ -\frac { t }{ 2 } }V src=https://huaweicloudobs.ahjxjy.cn/BC66412EC8460F297F10DADE1F2923AE.png style=vertical-align: middle; width: 137px; height: 56px; width=137 height=56/>
③
<img class=jc-formula data-tex={ u }_{ C }(t)=4{ e }^{ -2t }V src=https://huaweicloudobs.ahjxjy.cn/C9EAE4D5169E1CE68AA79AF30E8A2493.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex={ u }_{ C }(t)=4{ e }^{ -\frac { t }{ 2 } }V src=https://huaweicloudobs.ahjxjy.cn/EC1087DF130EAE55FF242BB932512B7C.png style=vertical-align: middle;/>
【单选题】
9-2 函数<img class=jc-formula data-tex=f(t)=3t{ e }^{ -2t }\E (t) src=https://huaweicloudobs.ahjxjy.cn/14F24D054899312E42EDFEF3471F039C.png style=vertical-align: middle;/>的象函数是 。
①
<img class=jc-formula data-tex=\frac { 3 }{ S(S+2) } src=https://huaweicloudobs.ahjxjy.cn/7710D41F847946C74052471764240393.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=\frac { 3 }{ S{ (S+2) }^{ 2 } } src=https://huaweicloudobs.ahjxjy.cn/C5FA9659BB7609A8A03D16C2EE101877.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=\frac { 3 }{ S+2 } src=https://huaweicloudobs.ahjxjy.cn/3DD2AC537099090821AA42F2D0ADB972.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=\frac { 3 }{ { (S+2) }^{ 2 } } src=https://huaweicloudobs.ahjxjy.cn/702C9A644D7D31DF897908842FFE8245.png style=vertical-align: middle;/>
【单选题】
8-9 图示电路中开关S原在位置1，且电路已达稳态。t＝0时开关由1合向2，则t≥0时电感电流iL(t)= 。<img src=https://huaweicloudobs.ahjxjy.cn/43298318804B9CCF594CCF84284D960A.jpg title=8-9.jpg alt=8-9.jpg width=376 height=166 style=width: 376px; height: 166px;/>
①
<img class=jc-formula data-tex=2(1-{ e }^{ -t })A src=https://huaweicloudobs.ahjxjy.cn/C8C6E5BE8ABD0FFC9E2D7240AC1670C1.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=2(1-{ e }^{ -\frac { 4 }{ 5 } t })A src=https://huaweicloudobs.ahjxjy.cn/D644EACC826EB824100E780793DFCB5F.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=2(1-{ e }^{ -\frac { 5 }{ 4 } t })A src=https://huaweicloudobs.ahjxjy.cn/CDB43BBB69497FC66803C867905E5139.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=2{ e }^{ -t }A src=https://huaweicloudobs.ahjxjy.cn/AA124E4F5192182D4163511F3FD9EB0A.png style=vertical-align: middle;/>
【单选题】
9-3 函数<img class=jc-formula data-tex=F(S)=\frac { 3S+5 }{ { S }^{ 2 }+3S+2 } src=https://huaweicloudobs.ahjxjy.cn/B288C19CDD5BF15335E9CCC724FE1856.png style=vertical-align: middle;/>的原函数是 。
①
<img class=jc-formula data-tex=2{ e }^{ -t }+{ e }^{ -2t } src=https://huaweicloudobs.ahjxjy.cn/14D0A25039E85EEA6E85EC1BEB397784.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex={ e }^{ -t }+2{ e }^{ -2t } src=https://huaweicloudobs.ahjxjy.cn/05FDC5E3F62107761669660A0CE60E03.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=2{ e }^{ t }+{ e }^{ 2t } src=https://huaweicloudobs.ahjxjy.cn/41D713F24D65CB9A4EEEBCC48D34604F.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex={ e }^{ t }+2{ e }^{ 2t } src=https://huaweicloudobs.ahjxjy.cn/2D8883EF8D1CA43AC9AE244C8000D23E.png style=vertical-align: middle;/>
【单选题】
8-13 二阶RLC串联电路，当R<img class=jc-formula data-tex=2\sqrt { \frac { L }{ C } } src=https://huaweicloudobs.ahjxjy.cn/9824AE613264BFC0C1C4FA08B24FDD7C.png style=vertical-align: middle;/>时，电路为振荡放电；当R=时，电路发生等幅振荡。
①
<img class=jc-formula data-tex=，\sqrt { LC } src=https://huaweicloudobs.ahjxjy.cn/B36C849FC9EEC2AB5997C762BBB83247.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=，\sqrt { LC } src=https://huaweicloudobs.ahjxjy.cn/57DBF6CF958A1541CDB96C603097E5F4.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=，0 src=https://huaweicloudobs.ahjxjy.cn/87142A7BBBB1BF2733FD51027551DFBF.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=，0 src=https://huaweicloudobs.ahjxjy.cn/9AA127AB21C6AEE53704C27870B0B4D5.png style=vertical-align: middle;/>
【单选题】
9-8 图示电路，开关S原打开，电路已达稳态，t=0时开关S闭合，则t0时的电容电压uc(t)= ，电感电流iL(t)= 。<img src=https://huaweicloudobs.ahjxjy.cn/0A9C8B5D213E97BC4EEE747FA07B154F.jpg title=9-8.jpg alt=9-8.jpg/>
①
<img class=jc-formula data-tex=100-50{ e }^{ -200t }V，1-0.5{ e }^{ -200t }A src=https://huaweicloudobs.ahjxjy.cn/07CE0885BF01EC41D4B74934D9DF8D0B.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=100-50{ e }^{ 200t }V，1-0.5{ e }^{ 200t }A src=https://huaweicloudobs.ahjxjy.cn/390AA18F0C343EEDC22BEBC01A6DA9B5.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=100+50{ e }^{ -200t }V，1+0.5{ e }^{ -200t }A src=https://huaweicloudobs.ahjxjy.cn/8B43598B68276D95C2AFE7EAAF065FA7.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=100+50{ e }^{ 200t }V，1+0.5{ e }^{ 200t }A src=https://huaweicloudobs.ahjxjy.cn/674B2986B9A63D1A5CF9E2746281C89E.png style=vertical-align: middle;/>