Ka la 16 Aug ho isa la 17 Aug, Oilbayer o ile a nka karolo maemong a indasteri a "Oil Well Cement Performance Requirements" e hlophisitsoeng ke Komiti ea Naha ea Tekanyetso ea Oli le Khase Komiti ea Tekheniki ea Boenjiniere ea Yichun City, Profinseng ea Heilongjiang, mme a kenya letsoho phapanyetsanong ea samente e amanang le eona. thekenoloji.
Nako ea poso: Sep-10-2018