【简答题】【消耗次数：1】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]10. The boards were[填空1]shape for further processing.
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【填空题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]4. If you dont lace up your shoes, youll[填空1].
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]6. We[填空1]hearing from you soon.
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]2. When they saw the horse, all stood still[填空1].
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]8. You[填空1]be ashamed of your foolish behaviour.
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]9. The great kings[填空1]on us from those stars.
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]7. Once,[填空1]a movie, she was knocked down by a running bicycle.
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]3. The woman was so excited at seeing her lost son and[填空1]him.
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]1. My dear, do not[填空1]such gloomy thoughts. Let us hope for better things.
【填空题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]5. As we gather once again among loved ones, let us also[填空1]to our neighbors and fellow citizens in need of a helping hand.
【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[assumption; contact; cliff; equivalent; emergency; outweigh; height; rummage; vibration; bugbear]10.[填空1]the Tourist Information Bureau for further details.
随机题目
【单选题】
1-6计算图1-6所示电路中负载吸收的功率。<img src=https://huaweicloudobs.ahjxjy.cn/4E31A023858FF1E4CE770CF0F2F350C5.png title=1-6.PNG alt=1-6.PNG/>
①
<img class=jc-formula data-tex=250W src=https://huaweicloudobs.ahjxjy.cn/71DB2ECD38A42CBFEAD1A73DE4D2CA22.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=-250W src=https://huaweicloudobs.ahjxjy.cn/A67BDA90F74302B896B16CD79A7671D8.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=90W src=https://huaweicloudobs.ahjxjy.cn/75DE63071556B28FA2849D93283BB238.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=-90W src=https://huaweicloudobs.ahjxjy.cn/CDF8E7154995F4E47156DDD0F31D9D17.png style=vertical-align: middle;/>
【单选题】
2-4应用支路电流法求题图2-4所示电路中的电流<img class=jc-formula data-tex={ I }_{ 1 },\quad { I }_{ 2 } src=https://huaweicloudobs.ahjxjy.cn/07E84BE6CD3710D833C6BCFD5D60F905.png style=vertical-align: middle;/>。<img src=https://huaweicloudobs.ahjxjy.cn/EC11F9DFA1628CC9EA7B31AA8C988763.png title=2-4.PNG alt=2-4.PNG/>
①
<img class=jc-formula data-tex={ I }_{ 1 }=-1A,\quad { I }_{ 2 }=-4A src=https://huaweicloudobs.ahjxjy.cn/B0896D5E27E8F90546D598F6605C8269.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex={ I }_{ 1 }=1A,\quad { I }_{ 2 }=4A src=https://huaweicloudobs.ahjxjy.cn/908CB7435C15FC844C5FAD090B688B2B.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex={ I }_{ 1 }=-1A,\quad { I }_{ 2 }=4A src=https://huaweicloudobs.ahjxjy.cn/585B380DE072748D346B1B6799169F42.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex={ I }_{ 1 }=1A,\quad { I }_{ 2 }=-4A src=https://huaweicloudobs.ahjxjy.cn/9793B8FC6A68D83DE19F6716CCD9F8A2.png style=vertical-align: middle;/>
【单选题】
2-3 应用电源的等效变换计算题图2-3所示电路中的电流<img class=jc-formula data-tex=i src=https://huaweicloudobs.ahjxjy.cn/641D2E4A3D85C72FAE695AE781733C7D.png style=vertical-align: middle;/>。<img src=https://huaweicloudobs.ahjxjy.cn/4334D3C8D3CDA7BBE14AA55ED43DB12E.png title=2-3.PNG alt=2-3.PNG/>
①
<img class=jc-formula data-tex=i=0.5A src=https://huaweicloudobs.ahjxjy.cn/36A3179738615E600D8A373ACC1287DB.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=i=-0.5A src=https://huaweicloudobs.ahjxjy.cn/C777C675F6B18786C9E1ED9812A770C6.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=i=1A src=https://huaweicloudobs.ahjxjy.cn/362940137AACCEA1628C86D9C27CC3B9.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=i=-1A src=https://huaweicloudobs.ahjxjy.cn/952096828605CA439243F9ABAA9A128F.png style=vertical-align: middle;/>
【单选题】
2-9 计算题图2-9所示电路中受控电压源发出的功率。<img src=https://huaweicloudobs.ahjxjy.cn/ADA2EDEAB47A14F874A5FFC429E309C3.png title=2-9.PNG alt=2-9.PNG/>
①
<img class=jc-formula data-tex=-\frac { 16 }{ 27 } W src=https://huaweicloudobs.ahjxjy.cn/0BF4B76AAA1E793D5A6D79E6A061EEA9.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=\frac { 16 }{ 27 } W src=https://huaweicloudobs.ahjxjy.cn/EDECF8C35E5FB103A5739C7A4702A611.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=-1.69W src=https://huaweicloudobs.ahjxjy.cn/18FDBB46CFF5725FDF0DD34390216493.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=1.69W src=https://huaweicloudobs.ahjxjy.cn/52BF604AC5D4F3C2FEF8E757C938D326.png style=vertical-align: middle;/>
【单选题】
3-4求题图3-7所示电路的戴维宁等效电路。<img src=https://huaweicloudobs.ahjxjy.cn/67875014C473A837124B95F7A185DB41.png title=3-4.PNG alt=3-4.PNG/>
①
<img class=jc-formula data-tex={ U }_{ oc }=\frac { 70 }{ 11 } V,\quad { R }_{ eq }=19.55\Omega src=https://huaweicloudobs.ahjxjy.cn/5546F2D093FC14D3AC541417E7A82B33.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex={ U }_{ oc }=-\frac { 40 }{ 11 } V,\quad { R }_{ eq }=19.55\Omega src=https://huaweicloudobs.ahjxjy.cn/D08F3BF612B181EFF7492CB4CF080C61.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex={ U }_{ oc }=\frac { 40 }{ 11 } V,\quad { R }_{ eq }=\frac { 50 }{ 11 } \Omega src=https://huaweicloudobs.ahjxjy.cn/23F900BE26E277B31A3AE359A3108B1B.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex={ U }_{ oc }=-\frac { 70 }{ 11 } V,\quad { R }_{ eq }=19.55\Omega src=https://huaweicloudobs.ahjxjy.cn/4E893A5A3FC46CE66EE93085D7486D0C.png style=vertical-align: middle;/>
【单选题】
1-3计算题图1-3所示各电路中电流源发出的功率。<img src=https://huaweicloudobs.ahjxjy.cn/8B29EEE1EF501AFD1E7037D07BE20A36.png title=捕获11.PNG alt=捕获11.PNG/>
①
<img class=jc-formula data-tex=25W src=https://huaweicloudobs.ahjxjy.cn/DEA18E85D48F211F5E5C905BB07FD83F.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=-25W src=https://huaweicloudobs.ahjxjy.cn/43970F8B6205306D3B53EB2DCEF0947A.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=50W src=https://huaweicloudobs.ahjxjy.cn/16E082C9EFA690A9DA8458CE1DC25098.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=-50W src=https://huaweicloudobs.ahjxjy.cn/871611B00E33A8311515498EC93EB91B.png style=vertical-align: middle;/>
【单选题】
2-5应用支路电流法求题图2-5所示电路中的<img class=jc-formula data-tex=U,\quad I src=https://huaweicloudobs.ahjxjy.cn/F41246A600904648DD90E01ADC276B58.png style=vertical-align: middle;/>。<img src=https://huaweicloudobs.ahjxjy.cn/641D2F5E65124565930B5D541C293231.png title=2-5.PNG alt=2-5.PNG/>
①
<img class=jc-formula data-tex=U=-2V,\quad I=-\frac { 1 }{ 3 } A src=https://huaweicloudobs.ahjxjy.cn/6BE1B486768573B08FC50C2F2F162CC2.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=U=-2V,\quad I=\frac { 1 }{ 3 } A src=https://huaweicloudobs.ahjxjy.cn/C3D09A73F0D2667B46D5798B1798A1DB.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=U=2V,\quad I=-\frac { 1 }{ 3 } A src=https://huaweicloudobs.ahjxjy.cn/120FCDE7249D411CD6496E8F80C9A262.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=U=2V,\quad I=\frac { 1 }3A src=https://huaweicloudobs.ahjxjy.cn/BA0416C454DECBC4AB63D683D5A143BE.png style=vertical-align: middle;/>
【单选题】
3-5题图3-5所示电路中，当RL为何值时可以获得最大功率，并求此最大功率。<img src=https://huaweicloudobs.ahjxjy.cn/92950B48D367E5D9334D311921498508.png title=3-5.PNG alt=3-5.PNG/>
①
<img class=jc-formula data-tex={ R }_{ L }=12\Omega ,\quad { P }_{ max }=12W src=https://huaweicloudobs.ahjxjy.cn/EB6B0A48A10675BE39E5C61B2841CEFA.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex={ R }_{ L }=12\Omega ,\quad { P }_{ max }=6W src=https://huaweicloudobs.ahjxjy.cn/AD6B7F1C5284CFE45005FC2BF595E443.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex={ R }_{ L }=6\Omega ,\quad { P }_{ max }=6W src=https://huaweicloudobs.ahjxjy.cn/482E79EB3133FD25A857ADCCF041D339.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex={ R }_{ L }=6\Omega ,\quad { P }_{ max }=12W src=https://huaweicloudobs.ahjxjy.cn/AACA307717D75F1E3F5E1EAB74B31775.png style=vertical-align: middle;/>
【单选题】
3-2 利用叠加定理计算题图3-2所示电路中电流源的端电压<img class=jc-formula data-tex=U src=https://huaweicloudobs.ahjxjy.cn/962F27352933EAF625F51E74FF866874.png style=vertical-align: middle;/>和独立电压源的电流<img class=jc-formula data-tex=I src=https://huaweicloudobs.ahjxjy.cn/CFE0FB65A01B097AD2957AEA6E52A94D.png style=vertical-align: middle;/>。<img src=https://huaweicloudobs.ahjxjy.cn/596160DFA3F92CE52878E78F84A20349.png title=3-2.PNG alt=3-2.PNG/>
①
<img class=jc-formula data-tex=U=-8.33V,\quad I=1.67A src=https://huaweicloudobs.ahjxjy.cn/5A78F8C378EF8FE312941774E4DA7852.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=U=8.33V,\quad I=1.67A src=https://huaweicloudobs.ahjxjy.cn/097ED1E08339C2546B69608FBDF4C32A.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=U=8.33V,\quad I=-1.67A src=https://huaweicloudobs.ahjxjy.cn/F47F43E57CD209D8C7894B8A3F27C58A.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=U=-8.33V,\quad I=-1.67A src=https://huaweicloudobs.ahjxjy.cn/8190E31C338FF76F9588B3ECA7134E74.png style=vertical-align: middle;/>