一.Menene ma'anar bututun ƙarfe mara nauyi Yana nufin babu walƙiya akan bututun ƙarfe, a cikin samarwa an yi shi da billet ɗin kai tsaye, saboda alaƙar da ba ta da kyau, yana da fa'ida mai kyau na juriya mai ƙarfi, galibi ana amfani dashi azaman tukunyar jirgi. , tube mai ɗaukar nauyi, tubing, ganga, yana da zafi r ...
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