Ohangari, nave az peshavu hunar. Ohangari dar zamonhoi qadim ba vujud omadaast. Dar hazorahoi 4—3 to milod dar Eron, Baynaniahrayn, Misri Qadim va gayra az ohan khelhoi gunoguni siloh, oloti mehnat va gayra mesokh- tand. Az in jost, ki az qadim boz dar Evropa, Osiyo, Afrika hunari Ohangari mamul ast. …

Ohanrabo, jismest, ki okhan va baze digar metallu khulahoro ba khud mekashad. Nigared Magniti doimi.

Ohanubeton, masolekhi binoko­rii suniest, ki az beton va arma- turai pulodi iborat meboshad. Dar konstruksiyahoi az Ohanubeton tayyor kardashuda mustahkamii beton ba fishurish va mustakhkamii armatura ba kashish samaranok istifoda mesha­vad. Istifodai yakjoyai in du masolehi khosiyatashon baso mukhtalif bar inho asos yoftaast: koeffisient i vaseshavii khosiyatashon khattii be­ton va …