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。
A discrimination equation for approximate calculation of solubility of sparingly soluble salts in water at finite condition is derived by finite error of permit.
该文介绍了恒湿盐湿度发生器的工作原理、误差分析、检定过程和标定结果。
The operating principle, the error analysis, the calibrating process and its results of calibration are introduced in the paper.
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