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Ar is The idea of a typical method for relationship rocks. The traditional K-Ar relationship technique is dependent upon the belief that the rocks contained no argon at time of formation and that all the following radiogenic argon (40Máy bay phun thuốc DJI Máy bay phun thuốc XAG Máy bay phun thuốc TopXGun Linh kiện - Phụ kiện Kiến