roofing filter造句

"roofing filter"是什么意思

造句与例句手机版

Roofing filters are usually crystal or ceramic filter types.
The most common use of crystal filters are at frequencies of 9 MHz or 10.7 MHz to provide selectivity in communications receivers, or at higher frequencies as a roofing filter in receivers using up-conversion.
It's difficult to see roofing filter in a sentence. 用roofing filter造句挺难的

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