A.cool the furnace to prevent pre-ignition
B.remove explosive vapors from the furnace
C.evaporate accumulated unburned fuel oil
D.provide sufficient air in the furnace to allow ignition of the fuel
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A.precipitate silica from solution
B.reduce corrosion in the heating coil
C.prevent clogging and erosion in the coil
D.maintain zero water hardness
A.cyclone furnace boiler type
B.dry back boiler type
C.water-tube type
D.critical circulation boiler type
A.fire-tube controlled circulation
B.fire-tube supercritical circulation
C.water-tube natural circulation
D.water-tube express circulation
A.Natural convection only
B.Forced convection only
C.Both natural convection and forced convection
D.None
A.water-tube natural circulation boilers
B.fire-tube boilers
C.water-tube forced circulation boilers
D.all of the above
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Using a file without a handle may result in （）
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
The treatment of the fuel oils involves storage, heating, filtering and（）
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
Under MARPOL Code the ship to which it applies has to carry （）
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）
Diesel engine air start system check valves are opened by （）
The main purpose of port State control is not to（）