【单选题】
2-1 求题图2-1所示电路的输入电阻<img class=jc-formula data-tex={ R }_{ ab } src=https://huaweicloudobs.ahjxjy.cn/6C6E461520C684943C6A930FE5BDF18E.png style=vertical-align: middle;/>。<img src=https://huaweicloudobs.ahjxjy.cn/5B3EF66A642BC4FD8C9FBBC1FF7D1E09.png title=2-1.PNG alt=2-1.PNG/>
①
<img class=jc-formula data-tex={ R }_{ ab }=3\Omega src=https://huaweicloudobs.ahjxjy.cn/7F8664EFB8C75064D1D4ABEB5392C174.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex={ R }_{ ab }=4\Omega src=https://huaweicloudobs.ahjxjy.cn/B30A8F74BCB7C356DAEC7404DCC96E2F.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex={ R }_{ ab }=3.4\Omega src=https://huaweicloudobs.ahjxjy.cn/A318A3B99CF30192A7E63F595A58F653.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex={ R }_{ ab }=4.4\Omega src=https://huaweicloudobs.ahjxjy.cn/A7F0D3B2C8B0E001E5889D9054C3FA97.png style=vertical-align: middle;/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/C70C4D4F4C5760814B2CD2E42638DEC9.png title=10.png alt=10.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/39E0349A08469B3CC12B75EAECF63B4D.png title=10-1.png alt=10-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/F91D5D2A0ADF7D1E2CA96634B74C010E.png title=10-2.png alt=10-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/87D6330915A8C18AFEE083D55F18BBF0.png title=10-3.png alt=10-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/3B287D30EBC3683E6CDAE2C632D28B48.png title=10-4.png alt=10-4.png/>
【单选题】
<imgdata-url="doc/a@F166ECE7E5C80E56201F2CF12A8211C6.jpg"data-preview_url_ueditor="doc/a@F166ECE7E5C80E56201F2CF12A8211C6.jpg"src="http://121.251.253.213/doc/a@F166ECE7E5C80E56201F2CF12A8211C6.jpg/download?time=636159463063828868&token=6B779CB0CF24492E5AC0BDCFF43DB14C&filename=jpg"/>
①
24
②
12
③
6
④
1
【简答题】
<img title="6.jpg" alt="6.jpg" src="https://huaweicloudobs.ahjxjy.cn/FB799E301C2A84AE4D1E4EC2EFBBC4E6.jpg"/>
【单选题】
<img title=2.jpg alt=2.jpg src=https://huaweicloudobs.ahjxjy.cn/D7BCB88AC21DEFE91FEA52C6C9BDF4F3.jpg/>
①
<img title=2-1.jpg alt=2-1.jpg src=https://huaweicloudobs.ahjxjy.cn/BE311DFD826A1846DC39578D9DEE833F.jpg/>
②
<img title=2-2.jpg alt=2-2.jpg src=https://huaweicloudobs.ahjxjy.cn/2F2D324123BBC285215E30D48338EBCA.jpg/>
③
<img title=2-3.jpg alt=2-3.jpg src=https://huaweicloudobs.ahjxjy.cn/6DED1F8DBD8561A42804FD4B874FD4E6.jpg/>
④
<img title=2-4.jpg alt=2-4.jpg src=https://huaweicloudobs.ahjxjy.cn/2C4A58C077ED840C8F62B65B8F56CFF4.jpg/>
【单选题】
将单元格L2的公式=SUM（C2:K3）复制到单元格L3中，显示的公式是（ ）。
①
=SUM（C2:K2）
②
=SUM（C3:K4）
③
=SUM（C2:K3）
④
=SUM（C3:K2）
【单选题】
<imgsrc="http://121.251.253.213/doc/a@62CCC9248E6C5CEC9ECB487FFBC2C519.png/download?time=636002476138068722&token=141D02AA787A7554363662D240011921&filename=png"data-url="doc/a@62CCC9248E6C5CEC9ECB487FFBC2C519.png"data-preview_url_ueditor="doc/a@62CCC9248E6C5CEC9ECB487FFBC2C519.png"/>
①
<imgsrc="http://121.251.253.213/doc/a@145B3AC53465C70D90DE0185C036A490.png/download?time=636002476212168852&token=AEBC4369C96DE92EF1B20DF70052F9C3&filename=png"data-url="doc/a@145B3AC53465C70D90DE0185C036A490.png"data-preview_url_ueditor="doc/a@145B3AC53465C70D90DE0185C036A490.png"/>
②
<imgsrc="http://121.251.253.213/doc/a@DBF4517EDFBD9FBFD42E1AEFD412897C.png/download?time=636002476292508993&token=DD1511B0D3AE73B8F5BF2C869A8F52F5&filename=png"data-url="doc/a@DBF4517EDFBD9FBFD42E1AEFD412897C.png"data-preview_url_ueditor="doc/a@DBF4517EDFBD9FBFD42E1AEFD412897C.png"/>
③
<imgsrc="http://121.251.253.213/doc/a@FD0B6F2E4606304A52FAF334BB5BC8E9.png/download?time=636002476370665131&token=D503206A410A9A758039EA014BC6A48F&filename=png"data-url="doc/a@FD0B6F2E4606304A52FAF334BB5BC8E9.png"data-preview_url_ueditor="doc/a@FD0B6F2E4606304A52FAF334BB5BC8E9.png"/>
④
<imgsrc="http://121.251.253.213/doc/a@1AAC94D22983B7C08A700950B6103C74.png/download?time=636002476446481264&token=7B31FF13B112C110C09DD7C42D18DC68&filename=png"data-url="doc/a@1AAC94D22983B7C08A700950B6103C74.png"data-preview_url_ueditor="doc/a@1AAC94D22983B7C08A700950B6103C74.png"/>
【单选题】
<imgdata-url="doc/a@CF364D682E7EDC3D6F4E30F2BB4F580C.png"data-preview_url_ueditor="doc/a@CF364D682E7EDC3D6F4E30F2BB4F580C.png"src="http://121.251.253.213/doc/a@CF364D682E7EDC3D6F4E30F2BB4F580C.png/download?time=635997629330923755&token=1279F1B02A815952B66C14C416407130&filename=png"/>
①
<imgdata-url="doc/a@FD3BE4B9A603A28900BA1CE5A4917F8F.png"data-preview_url_ueditor="doc/a@FD3BE4B9A603A28900BA1CE5A4917F8F.png"src="http://121.251.253.213/doc/a@FD3BE4B9A603A28900BA1CE5A4917F8F.png/download?time=635997629504240060&token=541E9A5C2B0C3ED87051C8D3BDF24F82&filename=png"/>
②
<imgdata-url="doc/a@7A41590BEFCFCBE74C6F7E89E7967805.png"data-preview_url_ueditor="doc/a@7A41590BEFCFCBE74C6F7E89E7967805.png"src="http://121.251.253.213/doc/a@7A41590BEFCFCBE74C6F7E89E7967805.png/download?time=635997629627012275&token=B43E29170C3B3757C96EB1A856117760&filename=png"/>
③
<imgdata-url="doc/a@99F8D6DB9EB3FB1C901B53915B0A099D.png"data-preview_url_ueditor="doc/a@99F8D6DB9EB3FB1C901B53915B0A099D.png"src="http://121.251.253.213/doc/a@99F8D6DB9EB3FB1C901B53915B0A099D.png/download?time=635997629743700480&token=080FC0D2FF79A92E265FCC56F38259B3&filename=png"/>
④
<imgdata-url="doc/a@827C3797B683CCCEE410F2ACE266DAAE.png"data-preview_url_ueditor="doc/a@827C3797B683CCCEE410F2ACE266DAAE.png"src="http://121.251.253.213/doc/a@827C3797B683CCCEE410F2ACE266DAAE.png/download?time=635997629843852656&token=89F3878D2896DF9EE9FFD429BD4960F7&filename=png"/>
【单选题】
设<img src=https://huaweicloudobs.ahjxjy.cn/300CB16352768F4BCF6038C00D0C6DD3.png title=2%NMVY%R3JQIA1T~XYJ6GRH.png alt=2%NMVY%R3JQIA1T~XYJ6GRH.png/>都可微，则<img src=https://huaweicloudobs.ahjxjy.cn/6B8B65CEB6BD24DC8D06E2B7A731AFCF.png title=P6OU4EST%G`[@ZYH2}{(Q$4.png alt=P6OU4EST%G`[@ZYH2}{(Q$4.png/>（ ）
①
<img src=https://huaweicloudobs.ahjxjy.cn/D8C5F2CA1ED0EE935F245CBFAA3E8260.png title=3N}3{1O6LH%@3{$%6F`U6XF.png alt=3N}3{1O6LH%@3{$%6F`U6XF.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/1C1DE5EA12376304E25716AFD6CE229E.png title=CTX9S$}TZ%CZ)`CTE}W7%HE.png alt=CTX9S$}TZ%CZ)`CTE}W7%HE.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/A59917150393546C50C201F91601E4CE.png title=EL[(L72PQ48NKGIJWCWA_Q2.png alt=EL[(L72PQ48NKGIJWCWA_Q2.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/49604A05019F9FFAA3DF9A5DFED81865.png title=OB$NBX]MD$$U%_3X`11[UZG.png alt=OB$NBX]MD$$U%_3X`11[UZG.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/2A1F4D073358137AC1F2767C1281A7B6.png title=7-C.png alt=7-C.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/A3EDCC513AD87B6DE0FF92469CAD1375.png title=7-1.png alt=7-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/14B2468B0D0D132B5E02053ED324A883.png title=7-2.png alt=7-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/32298C59ED758DA1F44F8CCE504D5E6E.png title=7-3.png alt=7-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/99502EC78B81F7366C2D6ED7FEF08D10.png title=7-4.png alt=7-4.png/>