梁的挠曲线近似微分方程是
举一反三
- 简支梁受载荷并取坐标系如图所示，则弯矩M，剪力Fs与分布载荷q之间的关系以及挠曲线近似微分方程为（ ）？<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/138661fa31514ec18f3260ea016751ba.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/c9a73bdd6deb4aab9f9896630a771c20.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/c71656ece7e440d98230ae56ffb09033.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/d2d3cc05628d40ca87ed8b079bf4b5db.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/221b51adf2024d8ab8fdc9963e10d940.png" />
- <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/2205d9f03e724a04b34f2f1045309079.png" />的幅频响应是，幅频响应是。 A: 1，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/760d7fcc2f264ed1b10fb836cb48f565.png" /> B: -1，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/21f685d2962e4b6993bfcaa513bdbf68.png" /> C: 2，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/57267e995f86426899ce3cc0177a2343.png" /> D: 1，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/ea8ba62853a94a15a5620c5165e3594a.png" />
- 直径为d的圆截面钢杆受轴向拉力作用，已知其纵向线应变为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/767e7380667c4d688dc6c10aaf9ef9ca.png" />，弹性模量为E，给出杆轴力的四种答案，问哪一种是正确的？ A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/8f37f5bc2dc94791b84f000092e493b3.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/073a4958352c4951b6171383bc4ca238.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/85f164582f934227b4bbb5ee0a7267dc.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/95e66fa0756f4ffd8c0ae368c0c88564.png" />
- 下列微分方程中常微分方程的是( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/c24b125c0b534b7696bf33f1e7b98c4c.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/2c9f694c97e9426596d13bed4bd474da.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/7ee1366ebe7a40aa868a143ba15c6ed0.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/d46e4fa33ea0443a938c267c2f07c6b4.png">
- 要使<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/c4b80714c3b14a559ae5bdcd09ef1fc6.png"/>是线性方程组AX=0的基础解系，则只要系数矩阵A=（ ）. A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/fb16cbefa5a746599e585bcf30dce878.png"/> B: ［2 1 1］ C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/df5d7a834bd44f44a519eaffffd47d39.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/5adacc7663b444d69f148ab2e7a11cf1.png"/>