Memba mai haɗa bututun gwiwar gwiwar hannu mai kauri mai kauri ya ƙunshi gwiwar hannu mai sifar baka, wanda ke siffata cewa akwai tsaga-tsaga ta madaidaiciyar haɗin gwiwa akan lanƙwan gwiwar gwiwar. Maƙarƙashiyar bangon gwiwar hannu ana yin su ne da baƙin ƙarfe, bakin karfe, ƙarfe na ƙarfe, ƙarfe na ƙarfe, ƙarfe na ƙarfe, carbon karfe, meta ba ƙarfe ba...
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