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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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。

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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。

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