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Comparisons of water use efficiency under different conversion models of cropland to grassland in the Loess Plateau of China Nonlinear singularly perturbed approximate solution for generalized Lotke-Volterra ecological model Bionomics dynamic model of human groups for HIV transmission A ANALYSIS ON THE PRECISION FOR PERTURBATIONAL ALGORITHM OF A CABLEWAY RELIABILITY DESIGN OF DRIVEAXLE HOUSING FOR FORESTRY MECHANARY