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研究了北京谱仪－Ⅱ主漂移室干扰噪声（ｐｉｃｋ－ｕｐ噪声）的主要表现形式，分析了噪声的来源，提出了解决办法。
The main manifestations of the main drift chamber noise (pick-up noise) of Beijing spectrometer-Ⅱ are studied. The sources of noise are analyzed and the solutions are proposed.