maintenance proof test
... maintenance program 维护程序，维修程序 maintenance proof test 检修保证试验 maintenance record 维修记录 ...
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保证了铁路罐车阀类试验数据的准确性，提高了检修质量，从而保障了行车安全，减轻了工人的劳动强度。
It also guarantees the accuracy of experimental data of railroad tank car valves, improves the overhaul quality, and thus ensures the traffic safety and reduces worker's labor intensity.
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