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Beam test results of 6- and 10-gap Multi-gap Resistive Plate Chambers (MPRCs) are reported in detail. The corresponding experimental setup at CERN PS-T10 area is explained. The time resolution and detection efficiency of the 6-gap MRPC is around 65ps, which is good enough for the TOF detector of STAR experiment, while the 10-gap MRPC has a time resolution below 55ps.