单词	pretreat
释义	pretreat /priːˈtriːt / verb [with object] Treat (something) with a chemical before use: the steel is pretreated against corrosion... Procedures for chemically pretreating archaeological charcoal vary only slightly from laboratory to laboratory, and all involve treatment with acid and sodium hydroxide. The coverslips were pretreated with sterile poly-L-lysine to improve cell adhesion to the glass. Perhaps it is theorized that by pretreating a component in a certain way, it will exhibit behavior more conducive to assembly. Derivatives pretreatment noun ... ‘Our improved method uses pretreatments to make the cotton as receptive to dye uptake as the wool,’ she says. Surface pretreatments, such as chromating or phosphating, are necessary to ensure good adherence of paint or lacquer finishes. Allegheny has pioneered the usage of pretreatments such as steam treating to clean and seal the porosity of powdered metal prior to coating.
随便看	quenelle quenselite quenstedtite quento querant quercetin Quercia, Jacopo della quercin quercine quercitannic acid quercitol quercitrin quercitron quercitron yellow querencia querent Querflöte querida querido querier querimonious querist querly quern quern-house

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