00507oas 2200181z- 450 991029172700332120230912170400.0(CKB)4100000007121917(EXLCZ)99410000000712191720230613cuuuuuuuu -u- -engPetroleum Exploration and developmentChinaKeAi Communications Co. Ltd2096-4803 JOURNAL9910291727003321Petroleum exploration and development1892777UNINA