Uhlobo lwe-valve yesitshalo sekhemikhali nendawo yokufaka isicelo (ngohlobo olusebenzayo)
Uhlobo lwevalvu yezitshalo zamakhemikhali kanye nendawo yokufaka isicelo (ngohlobo olusebenzayo) Ngemva kokusungulwa kwezinjini zesitimu, eminyakeni engamashumi amabili noma engamashumi amathathu edlule, ngenxa yesidingo sikawoyela ongahluziwe, izitshalo zamakhemikhali, izimboni zamandla, imboni yensimbi, imikhumbi, amandla enuzi ge. ..
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