Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.<br>A:main bearings<br>B:connecting rod bearings<br>C:piston pin bushings<br>D:All of the above

Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.
A:main bearings
B:connecting rod bearings
C:piston pin bushings
D:All of the above

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