图示对称封闭结构，杆件EI=常数，截面高度为h，材料线膨胀系数为α。计算如下结构内力，下列选项正确的是（ ）。A:
B:
C: 图中对称封闭结构可以取半边或四分之一结构简化
D:
举一反三
- <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/b4672b87107445c0978de191fa119efd.png"/>用位移法计算图示对称结构。各杆EI=常数。下列选项错误的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/30d417fb469c4bed94079d25513062de.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/160eda74dac74a2fb3a403918da72123.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/fa4d77df2cbb41508f8f0874d3a0a16a.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/bf5b181844ba40c394a4a636138d90bd.png" />
- <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/eeda346633f5425ab4482d83df8182a7.png" />用位移法计算图示刚架结构，下列内力计算选项正确的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/13d1ec532cc14b858e1edc9aedb9cc6c.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/e3c8e9de91074f92bdd8a4979fea19a2.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/21189921d7064cce807070431cd018a7.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/7bbedae8f3ee4b28a7f3f40dbc38cda2.png" />
- <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/9e1758fc408642e5b65ad96005c5343d.png" />用力法计算图示桁架结构，并求指定杆件的内力。已知各杆EA=常数。下列选项正确的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/381351aae1e343d4a83378d50dfb3f3f.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/e303b05f137d4f8b8f9e731cef7dbb5e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/604c205bceef42009d1bd9e598022a20.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/e5d7282c479e40539d88dc09d897d256.png" />
- 阿糖胞苷的化学结构为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/588c9b478695464b9617893b2e1c303a.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/86b60f7b512f43a29c8431f882722d1b.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/4546ccb30ea64350a626b0cd337e2c98.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/8f610edce6dd4a2e81ca814690e0b5ec.png" />
- <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/8273f43fdd98471b8baee5ccf0e6e11b.png"/>用力法计算图示刚架由温度改变引起的内力。已知各杆EI=常数，截面均为矩形，截面高度h=l/10；材料线膨胀系数为α。下列选项正确的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/7638f455b2714ef39a2139d9c7460230.png"/> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/ff9077cf9aec40e3a22406bacb89b92a.png"/> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/09369ce3b2a94f1e9d6a15edab4703ac.png"/> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/c8a1de8afd5c48f590909804c0e602d8.png"/>