line drift
... line deflection 行偏转 line drift 谱线漂移 line emission 谱线辐射 ...
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简要描述了北京谱仪(BES)主漂移室的结构和宇宙线实验安排，给出利用宇宙线测试主漂移室性能的主要结果。
The structure of the BES main drift chamber and arrangement of cosmic ray tests have been described briefly. The main test results of the chamber performance have been given.
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