Mitundu ya makwerero ochiritsira amasiyana kutengera zida ndi mawonekedwe, iliyonse imatengera momwe amagwirira ntchito. Zomwe zimagwiritsidwa ntchito kwambiri ndi zitsulo zamtundu wa carbon structural Q235B, zomwe zimadziwika ndi kupezeka kwake, kugulidwa, kukhazikika kwamakina, komanso chithandizo chapamwamba chapamwamba. H...
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