单选题The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the （）.AcamshaftBreduction gearsCrocker armDconnecting or piston rod
单选题
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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