A discrimination equation for approximate calculation of solubility of sparingly soluble salts in water at finite condition is derived by finite error of permit.
根据一定的允许误差，推导出难溶盐一定条件下，在水中溶解度的近似计算的判别式。
2
To solve the problem of high mistake rate caused by margin of error in classic discrimination tactic of test result, a discrimination tactic using membership function is introduced.