Ihe dị iche n'etiti nha SC na DN nke galvanized ígwè ọkpọkọ: 1.SC n'ozuzu na-ezo aka na welded ígwè ọkpọkọ , asụsụ STEEL CONDUIT, bụ shorthand maka ihe.2. DN na-ezo aka n'ọnụ ọnụ dayameta nke galvanized ígwè ọkpọkọ, nke bụ ọkpọkọ dayameta na-egosi pipụ ...
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