One type Aluminum Alloy cartridge design, to ensure that the internal parts and motor, tarpaulin from rain erosion, while greatly increasing the internal space.
一体式铝合金盒式设计，确保内部配件及电机、篷布免受雨水侵蚀，同时大大增加了内部空间。
2
The two special cement coatings are applicable to sewage pipeline internal corrosion for ductile iron pipe, improve the ability to resist the erosion of acid components in sewage.
这两种特殊水泥涂层均适用于污水管道用球墨铸铁管的内防腐，提高抵抗污水中酸碱成分的侵蚀能力。
3
The paper introduce the impurities origination including internal and external impurities, and pays more attention to re-oxide, rolling slag and inner-lining erosion.