... low-frequency stage ==> 低频段 low-frequency start ==> 低频起动 low-frequency stress ==> 低频率应力 ...
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Besides, the air conditioner system with frequency conversion has many virtues such as small start-up current, fast refrigeration or calefaction, low noises and so on.
此外，铁路客车空气调节变频控制系统还有启动电流小，快速制冷、制热，噪音小等优点。
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