该电路用在北京谱仪触发判选系统中，作为排除由于干扰信号造成主漂移室成片着火的本底事例。
This circuit is used in BES Trigger System to reject the background caused by interference in MDC.
本文叙述了北京谱仪触发判选系统的作用和判选过程，并分别介绍了系统各部分的物理考虑和构成。
The role and selection procedure of the trigger system of BES are introduced. The physical considerations and construction of its various parts are described respectively.
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