- Theeffectsofmacromoleculardispersantandsubzerotreatmentonthepreparationofultrafinenonagglomerativezirconiapowdershavebeenstudied.ThehardnessvariationofD2steelunderdifferentquenchingtemperatureandtheinfluenceofsubzerotreatmentonhardnessofD2steelwerest...
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- thesubzerotemperaturesofaSiberianwinterEveninsummerthetemperatureissubzerohere.Depressionofthepourpointofdieseloilandimproveitsfluidityinsubzero.WeatherforecasterspredictsubzerotemperaturesfortheendoftheweekinGermany.(APPhoto/FrankAugstein)Asmostofyo...
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