单选题The （） is a crystal which, under pressure, produces an electric current which varies with the pressure.AalternatorBglass thermometerCburdon tubeDpiezoelectric pressure transducer
单选题
The （） is a crystal which, under pressure, produces an electric current which varies with the pressure.
A
alternator
B
glass thermometer
C
burdon tube
D
piezoelectric pressure transducer
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