从0变化到+∝时，一阶不稳定环节频率特性的幅相特性极坐标图为（）A: 椭圆
B: 双曲线
C: 半圆
D: 圆
举一反三
- 17d60d34a7b4a2b.png从0变化到+∝时，一阶不稳定环节频率特性的幅相特性极坐标图为（） A: 椭圆 B: 双曲线 C: 半圆 D: 圆
- 从0变化到+∞时，一阶惯性环节频率特性极坐标图为（ ）。 A: 椭椭圆 B: 双曲线 C: 圆 D: 半圆
- 函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/80d8f8a04b644504a6d2e40a33d0eb32.png" >的<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/4b92518ac6a14134a358c16900e875c0.png" >阶麦克劳林公式为（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/7c2994f9242c43379c6a106d5bd92658.png" >； B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/2145f14f27224b189e702d3390e0a9ba.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/9ef01b77e76241d9b67b1c7c8cd0eea1.png" >； D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/a0feec59ac5046839ecb5324b27717e0.png" >；
- 消费者的效用函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/c885b0644278403790ff918dd6d8fe10.png">，预算收入400，价格从（1,1）变化到（2,1）的等价变化EV为（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/e2ffac36daf245a1bc886723b973076a.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/e752f5925717414eb99d272f7af25412.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/67e60ce37b6a429483269cc825c9c7f2.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/2e8b376d3f084d70880a54e21cf87275.png">
- 用脉冲响应不变法设计IIR数字滤波器时，模拟频率<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/c0c76989ac5c460d8e4b2d88ac956d95.png" />与数字频率<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/da882cbf151d46159a9888b929716c96.png" />之间的关系为（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/dbc00730300d4e24ae3b014e212b6425.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/6ed4917c68d342059f71784d83b15037.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/3a45e595b96949b18a9bb61b6750c16c.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/99b299c35c2545339e08005516fffacf.png" />