以下程序中，while循环的执行次数是http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/43f8e6f0d1d6455e82d242b5ecb62b49.png
举一反三
- <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" />
- 设<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/caa2009d65b9414e9eee2f311038ed51.png"/> 为系统输入，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/af57e24c7bb247e29a81996211b39e9d.png"/>为系统输出，则下列关系式中为线性时不变系统的是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/6d8d3ed4bbb5472d8ad95cf86ff40033.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/553b7fd10b744a38859127a91414813b.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/e59a6933e2c647d4b5c12b2ebb0a0ff6.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/4835c010dc244facb01784095e9bd080.png"/>
- C语言程序经过编译、连接后生成的可执行文件的扩展名是 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/c27145d4741c4f0f96beadcf86ba18ab.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/9f40e97bb87546d393b24501e95aae0b.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/c7e1150c6e0d4974ae48ddeb44c71cab.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/eb4766c9737948f5b631dd909d2b94e4.png" />
- LTI离散系统的差分方程为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/eb2e05fecafa414e98c3ffaf0b435e82.png" />，当激励<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/f6bdc410c9fd42b8b8dd675197919ceb.png" />时，求零状态响应<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/12bfebbed6b14e298e09c4cb1940677b.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/69fc6db7834143a292ce24d4829a06e6.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/f7af4326d64c44669cd0f0d4c7b23eb1.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/f929cab698bd4309a4649201e7f5604c.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/81108c43b5f2457291e3723cc96280e1.png" />
- 下列定义数组的语句中，正确的是 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/bce86560abbe4188b0be7d0139cabf5e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/5e1379bc3ed248bebf017b0f99b7336c.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/48fe317cb5984864892173700f139ef7.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/ac6f09707b864ab7aeae4a4f6dc14453.png" />