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查看更多By using the nonlinearity of the system parameters, the driving energy can be transferred to the signal energy, and the amplification can be realized. But parametric amplification also has a significant short board - it can only amplify the
查看更多On the evening of April 7, the new shares of star half Guide (603290. SH) disclosed the annual report of 2019. The companys total annual operating revenue was 779 million yuan, an increase of 15.41% year on year; the net profit attributable
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