水锈
2.The cleaner can clean various spots on urinal, bathtub, wall and ceramic tiles, especially effective to scale and urine.
4.A chemical solution, such as an acid, that is used as a bath to remove scale and oxides from the surface of metals before plating or finishing.
6.The application research of water-soluble polymer in concrete admixtures, in which including water-reducer, air-entraining agent, shrinkage-reducing agent, anti-washout admixture and corrosion inhibitors were summarized.
7.(3) 150kg/mu of slag powder of yellow phosphorus or 100kg/mu of lime could be used as the lower limit for controlling pH drop of acid paddy bellow pH4,and 300kg/mu of lime as the upper limit for improving the acid paddy.
