petrochémia 3 [vynechat] macromolecular materials industry 2 [vynechat] petrochemistry 2 [vynechat] priemysel makromolekulárnych látok 2 [vynechat] Corrosion 1 [vynechat] Petrochemistry 1 [vynechat] Petroleum industry 1 [vynechat] korózia 1 [vynechat] ochrana 1 [vynechat] plynárenský priemysel 1 [vynechat] ropný priemysel 1 [vynechat] technické normy a štandardy 1 [vynechat]