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在化学反应中一类三分子饱和反应的数学模型为__应用微分方程定性理沦，研究了该系统极限环的存在性、不存在性和惟一性问题．“,”Devoted to study a class of trimolcules saturated reaction dynamical system By using qualitative theory of ordinary differential equations,completely discussed the existance,nonexistance and uniqueness of limit cycles of the system.