单选题The slippers run （） in the crosshead guides as the piston and rod are （）and prevent the top of the connecting rod from moving sideways.Aup and down；reciprocatingBup and down；rotatingCback and forth；reciprocatingDback and forth；rotating
单选题
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
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