Moreover, such a long-term variation is related to the low-frequency variability of the Pacific sea-air systems, and the causes are sophisticated.

而且， 这种长期变化与太平洋海气系统成员的低频变化有相关性， 其变化成因是复杂的。

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Purpose: To establish a simple mathematical model for investigating the mechanism of frequency components in cardiovascular variability.

目的：建立心血管变异性的数学模型，探讨变异性频谱的主要频率成分机理。

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Capacihve moisture sensor regards frequency signal as variability, it is made up of capacitive probe, high frequency surge circuit, dispart frequency instrument and metal shield box.

电容式水分传感器以频率信号作为参变量，由电容探头、高频振荡电路、分频器和金属屏蔽盒构成一体。

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