The reversing cams of some four-stroke/cycle diesel engines are brought into position by （）<br>A:sliding the camshaft along its axis<br>B:rotating the cam 180<br>C:rotating the cam followers 180<br>D:moving the idler sprockets in the drive chain

The reversing cams of some four-stroke/cycle diesel engines are brought into position by （）
A:sliding the camshaft along its axis
B:rotating the cam 180
C:rotating the cam followers 180
D:moving the idler sprockets in the drive chain

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