While engine is in operation the piston moves up and down, thus causing the rotation of the （）.<br>A:crankcase<br>B:slipper<br>C:cam housing<br>D:crankshaft

While engine is in operation the piston moves up and down, thus causing the rotation of the （）.
A:crankcase
B:slipper
C:cam housing
D:crankshaft

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