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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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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

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