Parmai khok, asbobest, ki bo yorii on az chuqurihoi gunoguni khok namunaho megirand. Vobasta ba istifoda va prinsipi kor Parmai khoki davrzananda (dar natijai davrzani va fishor ba khok medaroyad) va zarbani (bo quvvai dast va zarbi bolta ba khok medarorand) meshavad. Namunai khokro baroi muayyan kardami kislo­ta, miqdori unsurhoi …

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