span 40 meaning in English
司盘 40
司盘40
Examples
- 2 low frequency resonance , spanning 40 - 100hz , occurs beside the track . the wheel rail interaction creep force and the sleepers natural frequency cause this
（ 2 ）列车行进之轮轨激振力频率与基钣自然频率发生共振产生40 - 100hz之低频噪音。