已知某RC低通滤波器,R=1KΩ,C=1uF,(1)求滤波器的截止频率(2)当输入为x(t)=10sin(500t+30°)+20sin(1000t+45°)+30sin(2000t+60°)时,求滤波器输出表达式y(t) 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 (1)截止频率为1/(RC)=1000 rad/s ,约等于160Hz(2)想精确...
若某RC并联电路在角频率ω时的等效复导纳为(4+j1)S,那么在该电路中在角频率为2ω时的等效复阻抗为()Ω。 A.0.25-0.1j B.0.25+0.1j C.0.2-0.1j D.0.2+0.1j 点击查看答案 第5题 某并联电路的负载等效复阻抗Z=6+j8W,则其等效复导纳为_s A. B. C. D. 点击查看答案 第6题 若某[图]串联电...
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作者 华峰 摘要 目的通过结直肠癌肝转移超声图像分析,为根据肝脏转移灶发现肠道原发灶提供一些依据.方法对我院全国中医肛肠中心结直肠癌38例患者,共79个肝脏转移灶的超声图像及临床资料进行回顾性分析.结果肝脏转移灶形状规则72个,占91. 1%;全部病灶... 关键词 超声...
Cooperative Processing for Improved NTSC Chrominance/Luminance Separation NTSC cross-color/cross-luminance artifacts are introduced in the television camera during NTSC encoding and also result from imperfect chrominance/luminance separation at the receiver. Camera-induced artifacts produce spectrally contamin....
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已知某RC低通滤波器,R=1KΩ,C=1uF,(1)求滤波器的截止频率(2)当输入为x(t)=10sin(500t+30°)+20sin(1000t+45°)+30sin(2000t+60°)时,求滤波器输出表达式y(t) 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 (1)截止频率为1/(RC)=1000 rad/s ,约等于160Hz(2)想精确...
PURPOSE:To improve facial accuracy, by a method wherein a soft metallic layer is formed on an external circumferential surface of a barlike body comprised of a fiber-reinforced resin material by sticking a thin cylindrical body composed of a soft metal close to the same through pressurization by...