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">

按热力学分类，由α相β相为一级相变，则其相变特征是() A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/c0fba5fc3fd9486e9595e057099b4fb7.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/31b0e59ca4514a2d920ffb2605ee1864.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/8669999525164f51bac9ed30f5067429.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/f39ef47427164774b6f4153c6c300e10.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/15cc1ade6dae4c6ead266095b40e6809.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/7347833ef3c5413f9e506e0f48ca519e.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/f39ef47427164774b6f4153c6c300e10.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/31b0e59ca4514a2d920ffb2605ee1864.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/8669999525164f51bac9ed30f5067429.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/c0fba5fc3fd9486e9595e057099b4fb7.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/31b0e59ca4514a2d920ffb2605ee1864.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/c4736875605d471fb62de7fdb639f4ae.png" >

铝合金拉伸实验的MOOC中，需要测试性能指标（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/418dff8a904f4789899ce32e4cd03b74.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/411578dcfdda41a3bc8821b9bfb1d916.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/806ea04e59cd436faec9f7992d126ee5.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/61011c7d884349459d41d9f3670d7d0e.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/57ab5cc8b9dd4fb0961726058a6e9c52.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/806ea04e59cd436faec9f7992d126ee5.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/61011c7d884349459d41d9f3670d7d0e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/32ff0f454bde4334ae385089a853b9ac.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/ab0315aab0fa4918a53714026df50fa3.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/806ea04e59cd436faec9f7992d126ee5.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/61011c7d884349459d41d9f3670d7d0e.png" />

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" />

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" />

下列方程为伯努利方程的是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202108/0622f56257874ab19e680d587fd8a4fc.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202108/5ce3fc785b724e3da7d07b8d6a0ecaf3.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202108/ab3de1c35e9e419fa301a33bddd5ee0c.png">+<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202108/2c226f2daecf40448b08c3b26a4db60e.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202108/88be95dd74814341a1894f32f073b9ec.png"><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202108/00fbcbc7c3574f94934fa3adc8843ccf.png">

对于下列已达平衡的反应体系，若压缩容器体积，增加体系总压力，平衡正向移动的是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/326095eaba6d40a3bc4057c25f7eae82.png" /><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/d5573e1b78574bdf970effa5e9509ef4.png" /><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/c8f59ca38f9a41db94d913281b203ada.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/41aeceac712749ada229b477082c26aa.png" /> <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/d5573e1b78574bdf970effa5e9509ef4.png" /> <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/0084729e370b40eab5afb29706560d04.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/f92df5cfb06d4322aca5548a0937215a.png" /><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/d5573e1b78574bdf970effa5e9509ef4.png" /><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/8fd7733b85054932be29f9c24c10f538.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/bfdf951768ce48989962f5ffbf5b8a97.png" /><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/d5573e1b78574bdf970effa5e9509ef4.png" /><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/6661619fa794442781036239c942bac3.png" />

在常体力的情况下，平面问题的应力函数与应力分量之间的关系正确的有（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/13db38e0be0f42a8aa8220026ad6d3e5.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/9178e461e0974317b42e0e9b59149047.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/d66f684595a1482283e180c311c9e8f4.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/20a366b5fd844f65a1716a7a6078b968.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/f4a5a69f1a264e5b8f28fa968022cbb0.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/b77e7d17deb548619be88f5ed437af81.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/cb0ce22cc89447b5b3a914b1a55209a0.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/d56afcca319e46a2be256f91ac5e289b.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/d6a4d2e83f9448cdbfec37887ffd53a9.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/1f5fa1a13a4c48698715e2b1814291b4.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/06c0cb7f6e184b18a6b345acff91e4bb.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/c59f70ea241546dd948d2f09b5821ac6.png">

铸铁拉伸实验的MOOC中，需要测试性能指标（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/53667f9a659c4652a1d73a3dd36986bf.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/875d968dec834cdfa4c3fe247d7aa2a8.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/5d8957af2d2a4f51819415939c6345f0.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/b636e1e0d6a94025871bb57705cf25bd.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/6219f1e929704d49b7379c136363c22b.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/b542e12f707949e0a011640e81330eea.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/68fe4ce598db473387b30de3c218f70c.png" />