01.ලෝහ වර්ග වලින් භාණ්ඩ නිෂ්පාදනය

Click https://www.e-thaksalawa.moe.gov.lk/moodle/pluginfile.php/34857/mod_resource/content/1/sg10_Destec_Chap1.2.pdf link to open resource.