A.distribution boards
B.section boards
C.emergency switch boards
D.main switch boards
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A.ultra much space
B.universal medium system
C.unit machined space
D.unattended machinery space
A.the engine crankcase
B.the engine scavenge boxes
C.drain tanks
D.fuel tanks
A.regulate the fuel supply
B.maintain a constant fuel viscosity at the fuel valves
C.maintain efficient cooling
D.alter the fuel density
A.pressure
B.temperature
C.volume
D.specific gravity
A."vacuum"
B."the excess of pressure above atmosphere"
C."figure on a gauge"
D.Any of the above
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To proceed to the assistance of a ship in distress is（）
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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
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The treatment of the fuel oils involves storage, heating, filtering and（）