变化的磁场激发的感应电场满足 ( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/f636147417d144a4ba1c35b5c019b5bd.png" />,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/c85cf7ff1a2b4ac1a1690f3c06424b52.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/d249e3e9419547bb942b3e012cb266ac.png" />,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/a53d71dd9ba14f6889f4a46ecb00b923.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/466f114b82234936ab3612322e18ae5b.png" />,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/a5968023d69c492a9d3559f5a59d81ba.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/836158ae6c8944a780cf31e1deb309a0.png" />,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/9b1930e33b5e4af78f37e7d0ca350c2d.png" />

在能够引入磁标势的区域内 ( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/03686a49cd944df9ba1b005d65f92230.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/df6b1c014a5045c1b6d26dd1b62ee428.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/6f3c4fe9e6df47239d7229e10c812aae.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/df6b1c014a5045c1b6d26dd1b62ee428.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/03686a49cd944df9ba1b005d65f92230.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/2f286a1497e94fc9ae658101f2ad49f7.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/23ebdfdb3444448e9a6f3c1342ce4b92.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/2f286a1497e94fc9ae658101f2ad49f7.png" />

下列结论中正确的是 ( ) A: 若数列<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/10b6bba1227b44138c6e945a1ed39646.png" />收敛, <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/803155493fdb46e9b6b97337cac5963f.png" />发散, 则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/b76a24d54cd14797b9d73350fb8fd255.png" />和<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/44f12c63e34f42de8a3d486c40cc0f8b.png" />均发散 B: 若数列<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/0ecfc168d33a4819870d7deec580bf4d.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/2b6a72dab9df455b8483d47797e10ca2.png" />收敛, 则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/96d1b9dbd68b4aa69eecfb1e7180d366.png" />和<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/2879af37195b495cb749871dcb11bf75.png" />均收敛 C: 若数列<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/85b08f06cfec4fa6a7f1e4758789a28f.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/f19f0281807047ca99dab5b88bbc3e32.png" />发散, 则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/a0fa01d49100430a939dedf78ec71ea7.png" />和<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/7634f23c1d5946dba3898912cd26e639.png" />均发散 D: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/4540a2e9908b4300b71f780481e0cfbf.png" />, 则必有<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/39287aa060f74d46a6d7fd3b54fd24b3.png" />或<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/b19925d5d7114e3398d729bb58d6fc4a.png" />

以下哪个家具是翘头案。( ) A: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/0dc8080097f94341851751cd492ad0f5.png"> B: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/e33f20662f944e6e90066e57cb72de23.png"> C: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/6bb23062cf8e486584f2516489d235f1.png"> D: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/2d207e48c3ae458295064a1661f33699.png">

84.下列内螺纹的画法正确的是（ ） A: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/c33cfc2d422941cca9f579dfe742a78b.png" /> B: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/160e85a31258446c8b4ac1d41fce87dd.png" /> C: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/b5f4789658934fdfb893570376769a7c.png" /> D: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/46f802e16e8d48f19c06acb8687c5d17.png" />

下列外螺纹的画法正确的的是（） A: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/00dc3ab97a48441e8ead8e77274beb59.png" /> B: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/de6a28aa41134b4d9e096f3578be1b07.png" /> C: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/ddd26f1ab38a4523abb1ab19e01dd567.png" /> D: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/6ca5035498e44dbd88e96dc4808213cc.png" />

以下哪个家具是四出头官帽椅（ ）。 A: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/cf35333886264e06943d71abc58500e2.png"> B: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/da7daee378fe4462be443d6b742c8b86.png"> C: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/f1689ee0c507447d9555b9d701df80ee.png"> D: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202110/f0c3c42ac10b42059153053472cd55ec.png">

空心圆轴的外径为D，内径为d，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/c268745e2545426ca7e4f20847abad16.png" />=d /D。其抗扭截面系数为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/c8afd0b0bde9471e9174ef404bfa0bd3.png" /> ； B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/0d280ef40b30438aacd3ab8ee129a3d2.png" /> ； C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/263e7ba4c4c24cdd853583eb10f4e0cb.png" /> ； D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/54112e744a1e487fa709a47f5a78160d.png" /> 。

进行轴心受压杆的设计时，合理的截面形式是根据 原则确定的。（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/351866917b1d4286b2f3c9fec7fb4b67.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/bee3290fbc9f4da78075a187033cef2c.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/08d9d0f06d4f4b2396e343d5052d59f4.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/07a2642ce15b4516b2290e87fb1a371d.png" />

压弯构件临界状态时，截面上的应力分布可能有三种情况，不可能出现的情况为(图中“+”表示拉应力，“—”表示压应力)（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/3488e21be56c455b8ab3263070b4ea2a.PNG" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/f94fd3e7151945f7855de94519f45701.PNG" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/76e3865bfbdf440b82dcd3ef1c7bf851.PNG" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/2b9fe89b8e3a4c9c928bc7abbcdf91f4.PNG" />