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mixinG Time шокXX) 23 4 1 COMPRESSIVE 567 STRENGHT (MPa) 2 5 10 12 15 20 25 (Y) 20) FOR X-Y 2 b) FOR X-Y linear model and regression coefficient quadratic model and regression coefficient mixinG Time шокXX) 23 4 1 COMPRESSIVE 567 STRENGHT (MPa) 2 5 10 12 15 20 25 (Y) 20) FOR X-Y 2 b) FOR X-Y linear model and regression coefficient quadratic model and regression coefficient