单选题Oil is supplied to the crosshead using a swinging arm or a （） and is sometimes boosted in pressure to and efficient lubrication.Atelescopic pipeBlarge bore pipeCgenerating pipeDcentral pipe
单选题
Oil is supplied to the crosshead using a swinging arm or a （） and is sometimes boosted in pressure to and efficient lubrication.
A
telescopic pipe
B
large bore pipe
C
generating pipe
D
central pipe
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