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【单选题】
Data transferred in the Data Link Layer is in the formA.
Physical
B.
Transport
C.
Network Network layer
D.
MAC sublayer of the data link layer
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【单选题】Trunk type diesel engine pistons are effectively cooled when heat is .
A.
radiated through the engine block
B.
transferred to water cooled cylinder walls
C.
conducted through the piston crown
D.
transferred to escaping exhaust gases
【单选题】In a medium speed diesel engine, a trunk type piston may be cooled by_______Ioil circulation though passages in the piston crown IIheat transfer through piston rings and liner wall
A.
I only
B.
II only
C.
either I or II
D.
neither I or II
【单选题】Trunk-type diesel engine pistons are most effectively cooled by heat_____.
A.
conducted through the engine block
B.
conducted to water cooled cylinder walls
C.
conducted through the piston crown
D.
loss to escaping exhaust gases
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