對。礦石有崮定，活動之分。也不用磁棒。後來河北三河農村用二級管檢波一級低放高阻舌簧喇叭聲音大。

來源: bithandy 於 2023-09-16 14:48:47 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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