The calculations indicates that the new combined operation and defrosting model can improve economics of heat pumps and stability and comfort of heat pumps' heating in low temperature surroundings.
计算分析表明：采用组合运行除霜模式可以提高热泵运行的经济性、低温环境下热泵机组供热的稳定性和供热舒适度。
The surroundings of the airborne electronic equipment is very bad. The electronic modules in the equipment must undergo the bad environment, such as high-low temperature, vibration and so on.
机载电子设备所处的工作环境非常恶劣，工作中电子设备中的功能模块经常要遭受诸如高低温、振动等不利因素的考验。
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