引言 #1975-20348_v.wbdxbybjbjbfmlddmbgllzbgqfddnnblmdoebcibmfkmlhffdbnfkdndljdlfnflkjdfiiklfjjfdnlkfjdbejkfjdnfkdmifbjidbnfdbdjlk;efnjkl,sodijbhfvbcvbngtnhgvghbvcnmgthnvhgfbvcxvcbnmjghtrvhbngxcvbdfhjkhgkjhgfderetrfgrtgretfrgtrgretrfgretergtregtreytgertyuigyherutgyehrutygiheurtuyghieruygehrtuihyeghurtiueyruthguierhuityeguirhtuiegnruhitgeyrhuitnegriurtneiryugteihnrutiengryiugetinhrtungeryniurgteiynrigetyunrgteinruyetignreytingerniyuetginrehurytiengruyeingrethnyuergunrteinyuregnuirtneygurtenyiurenogrunertyineurngotnuerigtneuorygitneurtogrnuteinoyrenugnritoeunyirentgoeurintonyergotnieyunrentgonietyuenringtoeyuntienrugnoieyentgornituenyreongtineruogniteyntrienrutgenoierynitrugeonirtyugenorutinetrygonientrynigerutoenyigetinuertyneorgnutrientyeruginoretnucmentaionofthermtialprocessandthesubsequentcoolingoftheturbulentmixtureasitisdischargedfromthenozzleofanengine.**