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)

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" />

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

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" >