Kungani idivayisi kagesi ye-valve ibonakala iyisimangaliso sokugcwala ngokweqile? Yiziphi izindlela zokuvikela?
Kungani idivayisi kagesi ye-valve ibonakala iyisimangaliso sokugcwala ngokweqile? Yiziphi izindlela zokuvikela? I-Petrochemical, i-power station, i-metallurgy nezinye izimboni zidinga umjikelezo oqhubekayo, oshelelayo, nokusebenza komjikelezo omude. Ngakho-ke, kudinga ukusetshenziswa kwe-valve kufanele kube ...
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