Ngowuphi umenzi wevalvu yebhola waseTshayina olungileyo? Umgangatho yinto yonke!
Ngophuhliso oluqhubekayo lwentsimi yoshishino, ukusetyenziswa kweevalve zebhola kuninzi kwaye kuninzi, kwaye kudlala indima ebalulekileyo kwi-petroleum, imichiza, igesi yendalo kunye namanye amashishini. Ke ngoko, ukukhetha umgangatho wevalve yebhola yaseTshayina ...
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