This is why high frequency transformers often have an air core.
这就是为什么高频变压器经常有空气的核心。
The value of a magnetic material core varies according to the frequency of operation.
核心价值一磁性材料根据不同的操作频率。
The core of this method is the selected-frequency amplifier.
而选频平衡法的核心是选频放大器。
The core of this method is the selected-frequency amplifier.
而选频平衡法的核心是选频放大器。
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