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LIU Lianga; ZHANG Binb; PAN Jin-xiaob a.National Key Lab for Electronic Measurement and Technology; b.College of science; North University of China; Taiyuan 030051; China; 中北大學(xué)電子測試技術(shù)國防科技重點實驗室;中北大學(xué)理學(xué)院;