Demolition and repair impeller impeller blades were damaged, or be bullied, such as the impact of corrosion, pitting the performance of many, should be to replace or hard alloy plating.

• 叶轮的拆卸与修理叶轮叶片被打坏，或受气蚀等影响，表现很多麻点，都应更换或镀硬质合金。