单选题The lower end of each piston rod is reduced in diameter to fit a bore in （）, this being secured to the piston rod by a nut.Athe crank-webBthe connecting rodCthe main bearingDthe cross-head
单选题
The lower end of each piston rod is reduced in diameter to fit a bore in （）, this being secured to the piston rod by a nut.
A
the crank-web
B
the connecting rod
C
the main bearing
D
the cross-head
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