The lower end of each piston rod is reduced in diameter to fit a bore in the cross-head, this being secured to the piston rod by （）.<br>A:a bolt<br>B:a cap<br>C:a disc<br>D:a nut

The lower end of each piston rod is reduced in diameter to fit a bore in the cross-head, this being secured to the piston rod by （）.
A:a bolt
B:a cap
C:a disc
D:a nut

出自：海船船员证

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