Girman haɗin gwiwa na ƙofar karfe mai hana wuta an bayyana a fili: babbar ‘yar’uwar ganyen kofa da firam ɗin ƙofar ba za ta zama ƙasa da 10mm ba, kuma rata tsakanin ganyen ƙofar da firam ɗin ƙofar ba zai wuce 4mm ba.

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