Oil is supplied to the crosshead using a swinging arm or a （） and is sometimes boosted in pressure to and efficient lubrication.<br>A:telescopic pipe<br>B:large bore pipe<br>C:generating pipe<br>D:central pipe

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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