The slippers run （） in the crosshead guides as the piston and rod are （）and prevent the top of the connecting rod from moving sideways.<br>A:up and down；reciprocating<br>B:up and down；rotating<br>C:back and forth；reciprocating<br>D:back and forth；rotating

The slippers run （） in the crosshead guides as the piston and rod are （）and prevent the top of the connecting rod from moving sideways.
A:up and down；reciprocating
B:up and down；rotating
C:back and forth；reciprocating
D:back and forth；rotating

出自：海船船员证

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