Ipayipi lensimbi engu-304 liyipayipi elisetshenziswa kakhulu elinokumelana nokugqwala okuhle kakhulu, ukumelana nokushisa, nokumelana nokukhathala. Isetshenziswa kabanzi embonini yamakhemikhali, i-petroleum, imithi, imishini, i-aerospace, neminye imikhakha. 1. 304 ipayipi lensimbi engagqwali indinganiso ① Amazinga ngamazwe...
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