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Yiziphi izinyathelo okufanele zithathwe ngaphambi kokusebenzisa i-vacuum sucker? Ngaphambi kokukhetha ama-vacuum suckers, kubalulekile ukwazi izinto ezimbalwa ezizokusiza ukwazi ukuthi intengo ilungile ngokwanele, futhi kuyokusiza nokuqinisekisa ukuthi utshala imali efanele. 1. Vacuu