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Among the main propulsion units on board the ship with the same capacity, the lightest one is_____.

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so as to never be integral lube  with a sloped bottom  only of nonferrous, noncorrosive metals  with draineturn lines terminating just above or at the designed normal level  
Electric  Hydraulic  Air  All of the above  
wheelhouse control station  engine room control station  captains office  chief engineers office  
the power of main engine will be reduced  exhaust temperature will be increased  the speed of the ship will be reduced  the propulsion characteristic of propeller will keep unchanged  
white smoke in the exhaust  high exhaust gas pyrometer readings  sparks in the exhaust  blue smoke in the exhaust  
telescoping  ring ‘snap’ gauge  inside vernier caliper  outside micrometer  
large conical springs  compressed air pressure  hydraulic pressure  exhaust gas pressure  
four-stroke  two-stroke  slow speed  reversible  
in addition to  in addition that  except for  except where  
alternator  turbo-charger  remote controller  windlass  
direct action of cam shaft  compressed air pressure  hydraulic “push rods ”  direct action of the main piston moving down  
governor droop  speeder spring tension  fuel rack lag  load on the engine  
disengaging the clutch firstly, then stopping the main engine  stopping the main engine firstly, then disengaging the clutch  stopping the cooling water pump firstly, then stopping the main engine  stopping the main engine and disengaging the clutch at the same time  
the power stroke  the compression stroke  low load operation only  periods of standby  
test the starting system  remove condensation from the cylinders  check the compression  check for proper lube oil pressure  
dial indicator  outside caliper  bridge gauge  tram rod  
one to supply steam to the main propulsion turbine  an auxiliary boiler  A and B  neither A nor B  
Bed plate  Column  Entablature  Tie rod  
cylinder heads  exhaust valves  scavenging air  injectors  
overspeed trip  audible/visual alarm  the ships/boats general alarm  reserve oil storage tank  

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