单选题The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.AlathedBshapedCshrunkDdeveloped
单选题
The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.
A
lathed
B
shaped
C
shrunk
D
developed
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