结果表明：截面高度对径向振动频率有显著影响，但是对切向振动频率影响很小；
The results showed that the radial frequency was greatly affected by the height of the cross-section, but the tangential frequency wasn't.
笔者提出了沿垂直方向、水平径向和水平切向振动时不同距离地震波衰减规律的经验公式。
An empirical formula was derived, which indicated the attenuation of the seismic waves at different distances along the vertical, horizontal and horizontal tangential directions.
那么单摆在振动过程中，切向力、法向力及合力的大小和方向是否在变化?。
Do the tangential force, the mormal force, the resultant force and their directions during oscillation of a simple pendulum change?
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