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单选题
Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, （）to a maximum as the piston approaches top or bottom dead center and then （） back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.
A
accelerates；decelerates
B
accelerates；accelerates
C
decelerates；decelerates
D
decelerates；accelerates
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更多 “单选题Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, （）to a maximum as the piston approaches top or bottom dead center and then （） back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.A accelerates；deceleratesB accelerates；acceleratesC decelerates；deceleratesD decelerates；accelerates” 相关考题
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none of the above
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compression load during power and compression strokesC
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crankpinC
crank journalD
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large boreC
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Decreased connecting rod bearing clearanceB
Increased connecting rod bearing clearanceC
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考题
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bedplatesB
columnsC
cylinder blocksD
safety caps
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worn connecting rod bearingsB
worn engine cylinder linersC
high cylinder firing pressureD
stuck spring-loaded manhole covers
考题
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fore and aft；up and downD
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考题
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考题
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考题
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考题
单选题The lower end of each piston rod is reduced in diameter to fit a bore in the （）, this being secured to the piston rod by a nut.A
piston gudgeon pinB
piston skirtC
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考题
单选题In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.A
reciprocating at the piston pin, rotary at the crank pinB
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考题
单选题Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）A
StationaryB
Full floatingC
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考题
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考题
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the block bearingB
the camshaft bearingC
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考题
单选题Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.A
main bearingsB
connecting rod bearingsC
piston pin bushingsD
All of the above
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