Its purpose in life was to be the local oscillator and mixer in AM radios, and a kazillion of them were made to fill that purpose.
它本来是被用作调
收音机中
本振和混频管，并且被大量生产出来以实现这个用途。
Its purpose in life was to be the local oscillator and mixer in AM radios, and a kazillion of them were made to fill that purpose.
它本来是被用作调收音机中本振和混频管，并且被大量生产出来以实现这个用途。
The maximum of B along elevation direction is closely under the central section of coil.The B of equiamplitude magnetic field is increased by increasing of the output current ...
频磁场磁感应强
随频电源输出电
加而加,磁场调处理能提磁场内磁感应强,提调波信号值电压,可有效提磁场内磁感应强。
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