Previous studies have shown that the ear canal amplifies certain frequencies, including those in the range of 2000 to 4000 Hz.
先前的研究表明，耳道会使某些频率增强，包括在2000到4000赫兹之间的频率。
Motion sensed by the body mainly in the 0.5 HZ ~50 HZ frequency range.
身体所能感知运动的频率范围通常在0.5赫兹到50赫兹之间。 义。
Adjust the motor frequencies of transmitter within (5-50) Hz, and not higher or lower than this range in accordance with the requirements of temperature and frozen freight situation for IQF machine.
根据单冻机的温度和货物冻结情况要求调节传送装置的电机频率，在(5—50)赫兹之间，不能高于或低于这个范围。
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