【单选题】
<img title=8-A.jpg alt=8-A.jpg src=https://huaweicloudobs.ahjxjy.cn/257240990B037030B51BCBCDBAC7A047.jpg/>
①
<img title=8-1.jpg alt=8-1.jpg src=https://huaweicloudobs.ahjxjy.cn/EC642B595250FA56196AD04EC5A9B7DC.jpg/>
②
<img title=8-2.jpg alt=8-2.jpg src=https://huaweicloudobs.ahjxjy.cn/931586B8029C21EF7D69BDFA80AAEA4D.jpg/>
③
<img title=8-3.jpg alt=8-3.jpg src=https://huaweicloudobs.ahjxjy.cn/747CDCE0D9E818F0F404B098238AD404.jpg/>
④
<img title=8-4.jpg alt=8-4.jpg src=https://huaweicloudobs.ahjxjy.cn/073B65239962EEAB04037156741881AC.jpg/>
【多选题】
<img src=https://huaweicloudobs.ahjxjy.cn/4DE29EFA21CB7D8D919C14C049187750.png title=1.png alt=1.png/><img src=https://huaweicloudobs.ahjxjy.cn/E85495858960DABC7D0670895F1502DC.png title=2.png alt=2.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/5329CCB367DC78F31026DD8A280B9DB7.png title=4.png alt=4.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/F0279F9E99540B5C6AD90E91695A90B0.png title=3.png alt=3.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/201DB0FD15C18B3A27CC64EEA281F911.png title=5.png alt=5.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/7EAB1F1D0550A6C5C24EEB0FFE8B0D00.png title=6.png alt=6.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/717575746AE6A02EE944B19789488877.png title=12.png alt=12.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/5FFBA01EACE8D91EBBDA3AC91546D35A.png title=12-1.png alt=12-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/41BC013D22B503777B5BC14B068AFE33.png title=12-2.png alt=12-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/04646B809C55F70CA9B6DAA3E27713E0.png title=12-3.png alt=12-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/175732821C975133EA1FC14566E3B604.png title=12-4.png alt=12-4.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/B8ACE38DABC64861372F60800849654A.png title=23.png alt=23.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/538541BB39D0B45057602F90C30BDF5D.png title=23-1.png alt=23-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/4A5847F1FBCE345626FB5193C3D70031.png title=23-2.png alt=23-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/2A0AC1E6FAC71639CCCCBBC88D4AFE16.png title=23-3.png alt=23-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/A69A4B8E6D1CD2D7A5AAFEF29EBCAAE9.png title=23-4.png alt=23-4.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/59FE83459A898F2177A322A74747018A.png title=13.png alt=13.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/727F23D332BB5243601652D4822E3346.png title=13-1.png alt=13-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/7113DF453A94B5C2B1258262AC6663A9.png title=13-2.png alt=13-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/AB9E57F8D7B248C32BAA428DB4E5F938.png title=13-3.png alt=13-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/25106B5A0B1F69DAA8F9E53BCF62DE25.png title=13-4.png alt=13-4.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/53BBA08102A9804D24050F5886505406.png title=4.png alt=4.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/03AA7225F537B4CE23CCBDA9CD2014DA.png title=4-1.png alt=4-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/6B27D5C77220D1F34C0B674C1EB57E7A.png title=4-2.png alt=4-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/3B8852C9BA45C556921C7069E97DE78B.png title=4-3.png alt=4-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/00CAD3FD1E49267F6C56CE42BA857417.png title=4-4.png alt=4-4.png/>
【单选题】
已知向量<img src="20190809/1565318424536224.png" title="1565318424536224.png" alt="图片12.png"/>的长度为3，方向向东，向量<img src="20190809/1565318432803809.png" title="1565318432803809.png" alt="图片11.png"/>的长度为4，方向向北，则<img src="20190809/1565318416857876.png" title="1565318416857876.png" alt="图片10.png"/>等于( )
①
<img class="kfformula" src="20190809/1565318471610307.png" data-latex="5"/>
②
<img class="kfformula" src="20190809/1565318471807250.png" data-latex="7"/>
③
<img class="kfformula" src="20190809/1565318471275858.png" data-latex="11"/>
④
<img class="kfformula" src="20190809/1565318471551260.png" data-latex="\sqrt {73}"/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/A13C622CE78172208EECE1702B271927.png title=YN@S[F)JHW0K}$[TH]LGQ46.png alt=YN@S[F)JHW0K}$[TH]LGQ46.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/FAE2E7CA1D723F1ECFCBBBB4CAA3BF93.png title=5CQ)RY9AMY{]OYV_(R8KH7C.png alt=5CQ)RY9AMY{]OYV_(R8KH7C.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/AFAB672380A5368C67A430D359B134E1.png title=XSHI[K5@A1BE`_K7_%8@_WN.png alt=XSHI[K5@A1BE`_K7_%8@_WN.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/253C713C3A5412169C63D5DB860B759A.png title=MU3S[NS{X73TU@`ON2)K7AE.png alt=MU3S[NS{X73TU@`ON2)K7AE.png/>
④
以上都不对
【单选题】
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=""/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/E72BCF901988035A6771052961A26F18.png title=15.png alt=15.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/49E5EFCF60637FDC9FC4E8DECF00AEC3.png title=15-1.png alt=15-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/846D426DF49FB38A6E09DC467C556FBF.png title=15-2.png alt=15-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/05D5E249D74B68BED0D2C1F283B4B988.png title=15-3.png alt=15-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/9B95BA34D5483BD2EF8B4B690F93BEE0.png title=15-4.png alt=15-4.png/>