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                                 Abstract:A cosmic-ray testing station (CORTS) in laboratory has been installed, and the performance of a prototype of CMS RE1/2 RPC was tested. The RPC's efficiency is about 85%, the time resolution is 0.87±0.08ns, and the spatial resolution is 1.5 times the width of read-out strip, which are in consistent with the results obtained using the muon beam at CERN. The comparison makes clear that cosmic-ray test can provide reliably the basic parameters which describe the RPC performance.
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