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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The shipboard oil pollution emergency plan will be invalid after （）
Using a file without a handle may result in （）
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During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
To proceed to the assistance of a ship in distress is（）