Hydroxyethyl cellulose (HEC) ndi yoyera kapena yopepuka yachikasu, yopanda fungo, yopanda poizoni kapena yolimba, yopangidwa ndi ma linter a thonje yaiwisi kapena zamkati zonyowa zoviikidwa mu 30% yamadzimadzi amchere, yotengedwa ndikukanikizidwa patatha theka la ola, Finyani mpaka chiŵerengero. madzi amchere amafika 1:2.8, ndiye kuphwanya. Ndi prepa...
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