Nyamavhuvhu 16 kusvika Nyamavhuvhu 17, Oilbayer akapinda muindasitiri chiyero che "Oil Well Cement Performance Requirements" yakarongwa neNational Oiri neGasi Standardization Committee Drilling Engineering Sub-Technical Committee muYichun Guta, Heilongjiang Province, uye vakapinda mukuchinjana kwesemende ine hukama. teknolojia.
Nguva yekutumira: Sep-10-2018