A:
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B:
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C:
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D:
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举一反三
- 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" />
- 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" /> 。
- 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" />
内容
- 0
普通螺栓受剪连接中,为防止板件被挤压破坏,应满足( ) A: 板件总厚度<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/b6bfc6c1a2cc4478a1246c26c5f6870a.png" /> B: 螺栓端距<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/a5fc37ea59a44e75b32a34bd22c72d4b.png" /> C: 螺栓所受剪力<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/e616805776464af6a15011241540c5d7.png" /> D: 螺栓所受剪力<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/4065fd6316794dc9a56c8ba84460b4c6.png" />(<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/1bd15ebc358842ff976b70777d8c6602.png" />为同一受力方向承压构件的较小厚度之和)
- 1
通过点<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/a13927df1bf542dfa036a32b10364f69.png" />的拉格朗日插值基函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/65695a42c7a14b649b6aa4fb68f7e499.png" />满足( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=1,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=1,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=0,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=0,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/f80e8e400f3f4916bcaf6b5fde757f16.png" />
- 2
图示结构,汇交于结点A各杆端的力矩分配系数为:()<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/d8fb108baf5043489469508c124eabc9.png"> A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/71af4aae8d3c4cc3a8236715c02d8dd0.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/ccfc76583f3a4a17a1b8ae5d350c35c7.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/0f214a006bf64228879035c5c64fba2a.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6e2d4cb58c943b19e51aa37b929a34d.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/7b66a4d0913142fabfdc2805b2971ecb.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/54e6491e78754550be4f562e0849acd0.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/115a0df0ea124266ae250912e8b572a1.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/b686ba286d90499a9729e57a8fea8e32.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/5c1a3965cc7245a0a9bca5f2eae645bf.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/3b342699d2aa451d9a227dff4928c65f.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/1d9ea5da536a4f18bd677cead25f28b2.png">
- 3
已知 f (t),为求<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202101/1fb776d0006a4eb2b93e07afcad58896.png" />则下列运算正确的是(其中<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202101/ada31d4207fe47d4908574b0a478486b.png" />, a 为正数)( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202101/fb0a09472a6b4408b3e833c2568308db.png" />左移<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202101/ada31d4207fe47d4908574b0a478486b.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202101/fb0a09472a6b4408b3e833c2568308db.png" />右移 C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202101/06dbb96ce1044280b13167a33033e4c6.png" />左移<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202101/ada31d4207fe47d4908574b0a478486b.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202101/06dbb96ce1044280b13167a33033e4c6.png" />右移
- 4
哪个标记用于表示 HTML 文档的结束?( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/6c4425eb00dd44f2a456cd3fa4e18488.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0db52a7ca0c0403d9f0e9f9784a1c655.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0f4f1b4846f940448a74df9e286abc77.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0dfd6a6c8d0f4ed2872185be16c2a849.png" />