free oscillations 自激振荡 ; 自由振动 ; 自由振荡
amplitude of free oscillations 自由振荡振幅
frequency of free oscillations 自由振荡频率
free oscillations of the Earth 地球自由振荡
amplitude e of free oscillations 自由振荡振幅
free directional oscillations 飘摆振动
Free And Forced Oscillations 自由和强迫振荡
Electric currents: electric current, Ohm's law, conductivity, Kirchhoff's laws, time varying currents, free and forced oscillations, condensers, inductance, complex impedance, resonant circuits.
电流：电流，欧姆定律，电导率，基尔霍夫定律，时变电流，自由和强迫振荡，电容器，电感，复阻抗，谐振电路。
By using the primitive equations of motion in spherical coordinates, free oscillations of the atmosphere are discussed.
利用球坐标中的原始运动方程组，讨论了大气的自由振动问题。
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