| http://www.w3.org/ns/prov#value | - Embedded along the sleeves' inner wall is the integrated sensing circuitry PCB board, which possesses such functions as sine voltage generation (Ui), axial tilt angle measurement (??0), mutual inductance voltage measurement (Uo), A/D conversion, and serial communication with the underground displacement measuring central processing unit by RS485 bus.The geometrical parameters of the proposed H-typ
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