testing certificate
... testing 试验；检验；化验 testing certificate 试验检定证书 testing equipment 试验设备 ...
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综合了有关硬度值修正的内容，并增加了按硬度计检定证书修正硬度值的内容，可供硬度试验人员参考。
Reference materials on correction of hardness value in the literature are compiled. A method of hardness value correction based on hardness tester calibration certificate is proposed.
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