An electric heater built into some smaller diesel engines is used to （）.
1、If you must make an electricity connec
If you must make an electricity connection in a poorly accessible spot, solder it and seal it against （）AmetalBwoodCwaterDplastic
2、An electrical device which employs a s
An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a （）.Amagnetic amplifierBship’s service alternatorCthree-wire DC generatorDsaturable core reactor
3、To extinguish an electrical fire, you
To extinguish an electrical fire, you should use （）.Amechanical foamBchemical foamCcarbon dioxideDsoda acid
4、Electric cargo winches have an overloa
Electric cargo winches have an overload safety device which normally cuts the current to the winch motor（）.Aafter torque causes line pull to ...
5、When fighting an electrical fire, you
When fighting an electrical fire, you should first （）.Astop ventilation to the areaBstop the vesselCsecure electricity to the circuitDapply CO2 to the fire
6、Some of the energy fed into the pump w
Some of the energy fed into the pump will be dissipated as （） due to mechanical inefficiencies, the remainder will be converted into pressure rise and fluid velocity.Ahydraulic headBstatic headCheat energyDsteam