金相检测 Metallographic Examination 化验 assay 常啮合齿轮 frequent meshed gear 压力试验 pressure test 耐热刚(钢)试验 heat-resistant steel test 镀锌件中性盐雾试验 Neutral Salt Spray Test of Galvanized Part 加工金相试样 metallographic specimen 金相组织和照片Metallographic Microstructure and photo
Laboratory test Meshing gear wheel frequently Pressure test Just tested heat-resistingly Zinc-plated pieces of neutral salt fog are tested Processing metallography sample Metallography organization and photo