Ⅰ.Uhlolojikelele Ezitshalweni zamandla ashisayo, amasistimu e-petrochemical, uketshezi olunamehlo aphezulu embonini yamakhemikhali amalahle, uketshezi oluxutshwe nothuli nezinhlayiya eziqinile, noketshezi oludla kakhulu, ama-valve amabhola adinga ukusebenzisa ama-valve ebhola avalwe kanzima ensimbi, ngakho-ke khetha insimbi efanele eqinile- ama-valve ebhola avaliwe.I...
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