In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.<br>A:telescopic pipes<br>B:large bore<br>C:drilled passage<br>D:tied rod

In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.
A:telescopic pipes
B:large bore
C:drilled passage
D:tied rod

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