Because warm air can hold more moisture than cool air, the relative humidity will be constant only if the amount of water vapor in the atmosphere increases as the temperature rises.
因为温暖的空气比冷空气能容纳更多的湿气，所以只有当大气中的水蒸气量随着温度的升高而增加时，相对湿度才会保持不变。
When the temperature control knob to set a temperature, hot and cold water mixing valve through proportional control into the outlet, the outlet temperature is always constant.
当温度调节旋钮设定某一温度后，混水阀通过调节进入出水口的冷热水比例，使出水温度始终保持恒定。
The temperature of cooled water could not be maintained in a desired range by a fan running at constant-speed in a cooling tower under different loads and environmental temperatures.
在不同负荷、不同季节和不同环境温度下，制冷机组的冷却塔风机恒速运行无法使冷却水温度控制在需要范围内。
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