單項(xiàng)選擇題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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1.單項(xiàng)選擇題As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）

A.Exhaust temperatures
B.Raw water pressure
C.Lube oil pressure
D.Air box pressure

2.單項(xiàng)選擇題The connecting rod is fitted between the crosshead and the crankshaftI t transmits the firing force, and together with the crankshaft converts the （）motion to a （）motion.

A.rotary；reciprocating
B.up and down；fore and aft
C.fore and aft；up and down
D.up and down；rotary

3.單項(xiàng)選擇題The intake ports of a two-strike/cycle diesel engine are opened and closed by the action of the （）

A.camshaft
B.piston movement
C.exhaust valves
D.vertical drive

4.單項(xiàng)選擇題Valves in the cylinder head of a diesel engine are opened by the direct action of the（）

A.exhaust pressure
B.valve spring pressure
C.rocker arm movement
D.wrist pin movement

5.單項(xiàng)選擇題On a large diesel engine installation, crankshaft axial alignment is maintained by the （）

A.piston rod guides
B.engine thrust bearing
C.crosshead bearing
D.main shaft flexible coupling