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BOURDON TUBE, A curved flat tube in a pressure gage for moving the pointer when pressure changes inside the tube. 包耑琯， 測(cè)壓計(jì)內(nèi)的彎曲扁琯，琯內(nèi)壓力的變化時(shí)它使指針移動(dòng)，以指示壓力。