某单音调频信号，则调频指数为（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/919bd25db19b4bb1a21ef51d53da20bb.png
举一反三
- 某单音调频信号，则调频指数为（）。
- 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" />
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/7fd9024d3a004d5990381d58527fa633.png
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/c12b9cef296b443ca06cd2980c89d3f7.png
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201801/1290f16d3bff44ee8c99d548a838f423.png