在[tex=1.5x1.0]I1C1iEfyXQRXAE6Kfy8uvw==[/tex]桥式正弦波振荡电路中,若[tex=1.5x1.0]I1C1iEfyXQRXAE6Kfy8uvw==[/tex]串并联选频网络中的电阻均为[tex=0.786x1.0]AOSTmhvIsOwsdZlGoks7dg==[/tex],电容均为[tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex],则其振荡频率[tex=4.143x1.357]XUQjGwfVBvyg2lCq0xs2ng==[/tex].
举一反三
- 图 6.1的[tex=1.5x1.0]La0nZ0xCwwiJ61Q2s/8Vbw==[/tex]串并联正弦波振荡电路,已知[tex=3.786x1.0]E1fRCbTb27SF7yykPsdRVA==[/tex] ,电容[tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex] 采用双联可变电容器,其变化范围为[tex=5.214x1.214]WF6ukMqiwLV3Z0KCoZBC8lJpPsVIJ3tlJod87MvYAog=[/tex], 试求振荡频率[tex=0.857x1.214]tHPCalaXLyTzkCpS1npYzQ==[/tex]的范围。[img=512x569]17998a447bb0d5f.png[/img]
- 若[tex=1.786x1.357]GYJ7X7XJijqizBuSGMrl3g==[/tex]在周线[tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]内部亚纯且连续到[tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex],试证:(1)若[tex=1.857x1.071]7rPBI34Q2mpj9E7/vhxpyQ==[/tex]时,[tex=4.143x1.357]+pWeRorbNxTM0GmkXzpPmA==[/tex],则方程[tex=3.071x1.357]LTnccpVHbe073DrIO6gKaA==[/tex]在[tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]的内部根的个数,等于[tex=1.786x1.357]GYJ7X7XJijqizBuSGMrl3g==[/tex]在[tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]的内部的极点个数。(2)若[tex=1.857x1.071]rOaeet5J+PwqfV28jYM8mA==[/tex]$ 时,[tex=4.143x1.357]yGYszs3HQdWtSKOZI+V5AQ==[/tex],则方程[tex=3.071x1.357]LTnccpVHbe073DrIO6gKaA==[/tex]在[tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]的内部根的个数,等于[tex=1.786x1.357]GYJ7X7XJijqizBuSGMrl3g==[/tex]在[tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]的内部的零点个数。
- 设 [tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex] 是一条周线,且设(1) [tex=4.143x1.357]Wy3cd4kyceqegPIDJ3x11j2jym1Kg4lFoW1rOkTlGpM=[/tex]在 [tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex] 内部亚纯,且连续到[tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex],(2) 沿[tex=7.286x1.357]XWbpt2HRfoTV0aZ1h1ig7I4qTwaTFFBXd7MFEm482XA=[/tex],则(试证) [tex=25.571x1.357]S/PgHmSM7NO+JOQc/JazMAFE9Aff9/2LMeNZ5hD7T7yaeXuvLfgKlxqQZzwI3KF3ViV8oQdGBLBAVp0DCcLlgsHXj3TH8EaufiCuCImQSp8=[/tex]
- 计算[tex=1.5x1.0]I1C1iEfyXQRXAE6Kfy8uvw==[/tex]串联电路的电导和电纳。
- 判断下列命题是否为真:(1)[tex=3.643x1.357]/5abqJjwKZ1qr+6hsVFF5EBvfq3ggOFNlHMClz0h9nk=[/tex](2)[tex=2.929x1.357]rGJpyjIjJpbcoBTWxP0Jiw==[/tex](3)[tex=4.5x1.357]2wycHMoqU83MyEp17iBils58bR7YLuCTI2G9NVAdlfY=[/tex](4)[tex=5.214x1.357]CTz2gu+IIm1GgNmYMGaduCRtA41wnW4WqwRWwEhq6aA=[/tex](5)[tex=4.857x1.357]1DcE2BMMOaZhTuxR/mjgsboXxfg5ET59Dp4I/jjEDuw=[/tex](6)[tex=4.643x1.357]BSryrsQYOvTP2hTWRu6t4nAuJwlSs4L9jaq70EpB+Us=[/tex](7)若[tex=6.0x1.357]y0IZLUnBO88nR8WBZYvd7QXv5S1OMINV5cQNzPyiyAc=[/tex],则[tex=3.429x1.357]1brfPwTkVVIX4GfoMIUskA==[/tex](8)若[tex=7.643x1.357]MhLfJXZnhbXiB0x3oNtFzThV4Y1mJxe1VYr7PkJE/T6hmTD3WWp+UxbNwvUQ6DHk[/tex],则[tex=4.143x1.357]LZUA94ISo1po5HWsOVeBCjo0rMvj7uw3bGw5HiZenrI=[/tex]