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.<br>A:the crank-web<br>B:the connecting rod<br>C:the main bearing<br>D:the cross-head

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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