Umbhobho wentsimbi luhlobo lwentsimbi enomngxuma omde cylindrical.Umda wokusetyenziswa kwayo usetyenziswa njengombhobho wokuhambisa ulwelo.Isetyenziswa ikakhulu kwimibhobho yothumelo lwemizi-mveliso efana nepetroleum, ishishini lemichiza, unyango lwezonyango, ukutya, ishishini lokukhanya, mech...
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