Ivalve yebhabhathane luhlobo lwevalvu esebenzisa idiskhi yokuvula kunye nelungu lokuvala ukubuyisela malunga ne-90 ° ukuvula, ukuvala okanye ukulungelelanisa ukuhamba kwe-medium.Ivalve yebhabhathane ayinalo nje ulwakhiwo olulula, ubungakanani obuncinci, ubunzima bokukhanya, ukusetyenziswa kwezinto eziphantsi, ukufakwa okuncinci ...
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