· pdf filekuprum kerana gangsa adalah aloi yang lebih keras daripada kuprum ... boleh...
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https://cikguadura.wordpress.com/
https://cikguadura.wordpress.com/
https://cikguadura.wordpress.com/
https://cikguadura.wordpress.com/
https://cikguadura.wordpress.com/
https://cikguadura.wordpress.com/
https://cikguadura.wordpress.com/
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