给定温度空气中湿度与其平常最大湿度的比率； 用百分比表示。
This represents the ratio of relative humidity of the air over a test solution compared with that of distilled water.
实验还发现，对霜层生长初期影响最大的两个因素是冷表面的温度和空气的相对湿度。
It is also found that the most important factors that influence the frost growth are the temperature of cold plate and relative humidity of air.
为了使抄纸过程的输出(湿度和基重)最大限度地接近给定值，采用BP神经网络PID控制。
In order for the output (humidity and base weight) in the copy paper process to approximate the given value as much as possible, PID controller of BP nerve network is used.
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