声频;
The research results show that the threshold values of power frequency electric field, power frequency magnetic field and audible noises with harmful influence on biology are higher than the relevant limited values of power transmission line;
研究结果表明:工频电场、工频磁场和可听噪声对生物有确定有害影响的阈值远高于输电线路有关量的限值;
Infection of different ultra audible frequency and temperature to dispersive property of ZnO nanometre granule
不同超声频率与温度对纳米ZnO颗粒分散性能的影响
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