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Large engineering ship propellers include determining parameters such as propeller diameter, pitch, and number of blades.

Large container propellers - During operation, if the air pockets are near the surface of the propeller, the blade material will corrode due to long-term and sustained hydraulic impact, resulting in pitting corrosion.

Marine generator gearbox - check the appearance and sealing of the gearbox. The appearance inspection mainly checks whether the gearbox has obvious damage, corrosion or oil leakage.