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
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1.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
2.單項(xiàng)選擇題Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?（）
A.Sealed motors
B.Drip proof motors
C.Enclosed motors
D.Watertight motors
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