The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the （）.<br>A:camshaft<br>B:reduction gears<br>C:rocker arm<br>D:connecting or piston rod

The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the （）.
A:camshaft
B:reduction gears
C:rocker arm
D:connecting or piston rod

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