单选题The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.Athe connecting rodBthe cross-headCthe piston rodDthe air box
单选题
The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.
A
the connecting rod
B
the cross-head
C
the piston rod
D
the air box
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