A.Fan
B.Pump
C.Winch
D.Machine tool
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A.number of turns of wire in the armature coil
B.number of magnetic poles
C.strength of the magnets used
D.output voltage
A.diode
B.transformer
C.transistor
D.rheostat
A.Transducer
B.Reducer
C.Transformer
D.Rectifier
A.magnetic shield
B.electromagnet
C.piezoelectric device
D.electromagnetic domain
A.Sealed motors
B.Drip proof motors
C.Enclosed motors
D.Watertight motors
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To proceed to the assistance of a ship in distress is（）
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Using a file without a handle may result in （）
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As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）