單項(xiàng)選擇題The device that most commonly utilizes the principle of electromagnetic induction is the（）.
A.diode
B.transformer
C.transistor
D.rheostat
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1.單項(xiàng)選擇題Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）
A.Transducer
B.Reducer
C.Transformer
D.Rectifier
2.單項(xiàng)選擇題A direct current passing through a wire coiled around a soft iron core is the description of a simple（）.
A.magnetic shield
B.electromagnet
C.piezoelectric device
D.electromagnetic domain
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