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Pressure drop curve of the detection point on the right side of the leakage hole of the buried natural gas pipeline: (a) 0.8 MPa pressure 1 m buried depth; (b) 1.6 MPa pressure 1 m burial depth; (c) 2.0 MPa pressure 1 m burial depth; (d) 4.0 MPa pressure 1 m buried depth; (e) 6.0 MPa pressure 1 m buried depth.
