The_______is a crystal which, under pressure, produces an electric current which varies with the pressure
A.alternator
B.glass thermometer
C.bourdon tube
D.piezoelectric pressure transducer
第1题:
[A] which [B] what [C] that [D] it
第2题:
A) when
B) how
C) that
D) which
第3题:
第4题:
There is a slight infection in the lung, which ________ is not serious.
A of itself
B to itself
C in itself
D on itself
第5题:
[A] that [B] which [C] than [D] as
第6题: