单选题In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.AcrossheadBcrankpinCcrank journalDgudgeon pin
单选题
In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.
A
crosshead
B
crankpin
C
crank journal
D
gudgeon pin
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