I-Ribang sele ivelisa i- I-oyile ye-injini yepetroli eyenziwe e-China iminyaka emininzi kwaye yenye yeengcali I-oyile ye-injini yepetroli zabenzi kunye nababoneleli e-China. Sinefektri yethu kwaye sineemveliso ezininzi kwisitokhwe. Unokuqiniseka ukuba uthenge iimveliso ezilungiselelwe thina. Abathengi banelisekile ngemveliso yethu ephambili kunye neemveliso zamva nje zokuthengisa kunye. Silangazelela ngokunyanisekileyo ukuba uthengise iimveliso ezithengiswayo, siya kukubonelela ngeesampulu zasimahla.