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？？【案例二】某实验室使用3等量块开展测长仪示值误差的校准。？？？？为了进行标准器的稳定性考核，实验室采用每3个月使用测长仪测量标准量块10次，其平均值的变化不超过0.3μm，即满足校准MPE=±1+L/100(μm)测长仪的稳定性要求。？？
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