当振管垂直立于磁场环境中时，在交变磁场的作用下产生磁致伸缩，即沿振管的轴向作简谐振动。
Vibration tube in the magnetic field vertically brings about magnetostriction under the effect of alternate magnetic field, that is axis resonance.
当振管垂直立于磁场环境中时，在交变磁场的作用下产生磁致伸缩，即沿振管的轴向作简谐振动。
Vibration tube in the magnetic field vertically brings about magnetostriction under the effect of alternate magnetic field, that is axis resonance.
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