When such fields do not vary with time they are referred to as static and have a frequency of 0 Hz.

当这种磁场不随着时间而发生变化时它们被称为静态，所具有的频率为0赫兹。

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These high frequencies correspond to the rotation speeds of centrifuges; America tightly controls the export of frequency converter drives able to operate at frequencies above 600 Hz.

这些高频率与离心机的转速相对应；美国对能够以600赫兹以上频率运行的频率转换器驱动的出口进行了严格管控。

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It USES the value of 1 as the default for the audio channels and the value of 44100 Hz as the default audio sampling frequency.

它使用值1作为声道的默认值，使用值44100 Hz作为默认的音频采样频率。

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It provides a remarkably flat frequency response over a 10-Hz to 22-kHz bandwidth, a dynamic range of 92 dB, and algorithmic delay of less than 1.89ms.

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The SS-AR2's incorporated drivers support a maximum input power of 100 watts through a 25 mm (one inch) soft dome, a 130 mm (five inch) sliced-paper cone and a 165 mm (six and a half inches) aluminum cone (double-drive system), producing a frequency response from 42 Hz to 60kHz.

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