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