中国大学MOOC: 电路如图示。已知http://nos.netease.com/edu-image/C4BEECC8F6E9D07F38225A63362870E9.jpg?imageView&thumbnail=520x520&quality=100= 500HZ，电容C取1微法，则电路的巴特沃斯低通滤波器参数：R»________，http://nos.netease.com/edu-image/FE2556BC6BBC47835D2A80BC10624C93.jpg?imageView&thumbnail=520x520&quality=100________。
举一反三
- 中国大学MOOC: 假设角 http://nos.netease.com/edu-image/9454BE04B70783537F8315FB45F1D7C6-1443931645905?imageView&thumbnail=520x520&quality=100终边恰好经过点P(3，-4)，则http://nos.netease.com/edu-image/6674A8662F743146C3F820A2CF48BCE9-1443931750374?imageView&thumbnail=520x520&quality=100=
- 中国大学MOOC: http://nos.netease.com/edu-image/C801EB5D68AD5600FB04ED8EC3B700BD.jpg?imageView&thumbnail=520x520&quality=100
- 中国大学MOOC: http://nos.netease.com/edu-image/9605288F1533A44AB29E716607D0DE28.jpg?imageView&thumbnail=520x520&quality=100
- 中国大学MOOC: http://nos.netease.com/edu-image/263E7A50C462A6E18D104552BB19F2A3.jpg?imageView&thumbnail=520x520&quality=100
- 中国大学MOOC: http://nos.netease.com/edu-image/3AC97B2CA957B0F0220A4315EE5692EE.jpg?imageView&thumbnail=520x520&quality=100