【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/CDF7C86F62D49070BB62EB3FE15FED84.png title=4.png alt=4.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/EDA71533D280D7ECEAEE189716E5E890.png title=4-1.png alt=4-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/A0DEF06340DFF0A4996119CBCD107DA0.png title=4-2.png alt=4-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/27DF27F32AC440FCB5A56F8525D3CEC4.png title=4-3.png alt=4-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/35F162C359A92F1097CDB26CA5B417D3.png title=4-4.png alt=4-4.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/265846F6D50C0338CBD1E2519B1F41D3.png title=4.png alt=4.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/0B597BE8BDA0B795349190D9DBC4F166.png title=4-1.png alt=4-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/BABAC19A382691F6DEAF2E5343DB4858.png title=4-2.png alt=4-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/CAF3C45004979241B0FE9911908E527B.png title=4-3.png alt=4-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/D30017D259D1619D58BFB18400BF5522.png title=4-4.png alt=4-4.png/>
【简答题】
<img src="https://huaweicloudobs.ahjxjy.cn/D7F1520B4EF6626C95379CDCD5008DB9.png" title="4.png" alt="4.png"/>
【判断题】
<img src=https://huaweicloudobs.ahjxjy.cn/B3DF7DADBAD32A4D7A8ACD06B67EA145.png title=4.png alt=4.png/>
①
正确
②
错误
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/0AEE6D28A479E3CFC01F6B0A0AAA565E.png title=4.png alt=4.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/5F1DF376BB746AC7C50DE292DF7F3F00.png title=4-1.png alt=4-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/2120CD63C9698A84B5E593D203078EC9.png title=4-2.png alt=4-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/1BA088B65ED6FA5D7A6BE25820DD3F05.png title=4-3.png alt=4-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/4C2B331B0ADB11541DED913DC5535EDF.png title=4-4.png alt=4-4.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/E285729361C8255EED427B6769C26599.png title=4.png alt=4.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/3921DA6BF6A228B85831C66C596A50C6.png title=4-1.png alt=4-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/96890382153F88A88887663E157497EB.png title=4-2.png alt=4-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/0CDE5B7F13D5136BA1E33FEEA409E4D3.png title=4-3.png alt=4-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/DBDDB437DA76FDDF816E204D8AF1F37D.png title=4-4.png alt=4-4.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/5D4CBB356F877148D6449048522A2185.png title=4.png alt=4.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/A2DABF38F3AF3B36DBF025AA23F4F807.png title=4-1.png alt=4-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/088A007A927A0EC33B29E097EFD64EE3.png title=4-2.png alt=4-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/83769A66D5DA963CFC6AF9985C6276EA.png title=4-3.png alt=4-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/D208CC045685F7F275B258045772D36E.png title=4-4.png alt=4-4.png/>
【单选题】
<img src=http://60.205.157.60/course/a@F87801D9001E1076D65A77D630877600.jpg title=单选题图5.jpg alt=单选题图5.jpg/>正方形结构如图5所示，已知各杆的EA都相同，则斜杆1-3的伸长为( )。
①
Δl=2Fa／EA
②
Δl=0
③
Δl= Fa／2EA
④
ABC均错
【判断题】
<img src=https://huaweicloudobs.ahjxjy.cn/BC6BE4E96DA1F46217B66358B0B55D94.png title=4.png alt=4.png/>
①
正确
②
错误
【判断题】
根据图所示切割体的正面投影和水平投影，其基本体是圆柱体。<img src=http://60.205.157.60/course/a@4A86563E6B6DA06893F711ACC27EA6B8.png title=4.png alt=4.png/>
①
正确
②
错误
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