A:
B:
C:
D:
举一反三
- 负反馈系统的开环传递函数为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/a7ed7837bacb42a0bc3a3b685f1f59ca.png" />,若要绘制参数<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/20abe260498a4ba4ac78f48ef331ea76.png" />的根轨迹,其等效开环传递函数应该是( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/3fd90fdfd9534f81b6f4b6052f381f27.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/c39a9d3fb81b47bead514a12c4ad843d.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/916d03716ed144c58426442cc710f9fa.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/2f2d63241a46476a9ece1e3ccd8e96e5.png" />
- 正六边形的尺寸标注正确的是( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/51b59d5c82e7484292873ae39ff944fd.jpg"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/dad8740e848246faae714a02eb3e79f6.jpg"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5d7eebc6e83247cd921d440438341839.jpg"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/ef49ee3205524fb5b9fc6c643aef5bad.jpg">
- 以下属于典型二阶欠阻尼系统的是。( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/17af3a9e051c466584b8cec615049edd.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/6c04a26728e34a868e6efa4d4043d018.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/7c45b6ba62234c5e978202c49dd4b455.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/8f6cf90035484380beadadba728063ac.png" />
- 零初始条件下系统的微分方程如下0.2<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/a9016a8e310743f2bd58d7f9c8d9d679.png" />,则系统的传递函数为( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/a4bea77a2206422f94416a8b92b1ae1b.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/8012e0d7f6374e61aeb25b284d85b182.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/9ba5daef946e4f8aa8a46e162da7a01d.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/0282eee3912a4d9586d3d28f4fbfc4b1.png" />
- 源电压放大倍数与电压放大倍数的关系是 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/2f6b445b00df4646b4edacaddd79a7af.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/4a0b0c930f934ecdb98e4d8b0c3fe3b4.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/d873f32851bf4ff196a2acbb25974b7e.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/a5405728c76b40e9ba50a7cf3fd20f7b.png" />
内容
- 0
逻辑函数F (A,B,C)=Σ m (0,1,4,6)的最简与非-与非式为( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/6677dfd1ca0a4255871fff8d24c1bfe1.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5556e6fba4d849c988d994a19156d44a.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/6f296abd190d40b19f2f737f02c7adca.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/b2bf2478b09b4e6ab818d71adb4a8715.png"/>
- 1
图示有侧移结构,设横梁的水平侧移为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5b1b0d2260734afd9d372476eccd0a52.png"/>,计算约束状态下杆件的固端弯矩,正确的是( )<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/0bb431e37a424b1f841ad9350d80f241.png"/> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/ef65ff72dc6b4179bee92ce4ff148aad.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5ca987b52284485a986cb954a09b51a0.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/0c7f5a6de2714ac0bbb5a243d9b8da4b.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/94aab58ed2f94f90af7c4ea00aecf764.png"/>
- 2
<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" />
- 3
求解线性方程组Ax=b,当detA≠0时,方程组的解是( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/2dd3562df6f94737b874abc058d6f140.png" /> B: A/b C: b./A D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/feb99de14dd442cab2629dac769711db.png" />
- 4
若x2+y2=1,则dy为( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/d045b5f235a54083ab91e6f717cf00d8.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/74173c5355234874ab8cb9275865d5d6.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/bbfb37ba58fc4de0aa8688e0bb53cef5.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/f9a206c25e8c4ea1bd7b51519afd76b7.png" />