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In this paper,we prove the existence of at least one positive solution pair(u,v) ∈ D1,2(RN) × D1,2(RN) to the following semilinear elliptic system △u = K(x)f(v),x ∈ RN,△v = K(x)g(u),x ∈ RN(0.1) by using a linking theorem,where K(x) is a positive func