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The oxidation kinetics of natural rubbers prepared by coagulum of fresh natural latex coagulated with formic acid or microorganisms were studied. The maturation time of coagulum is 6, 12, 18 and 24 hours respectively. The results show that the oxidation activation energies of natural rubbers prepared...

Along with the rapid development of modern society, the quantity of secretaries needed by society is rising year by year. The huge demand brings about opportunity and impetus for the vigorous development of secretary vocation but is also accompanied by such phenomena as varying professional quality of...