單項選擇題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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1.單項選擇題The engine has one or two group of fuel pumps, depending upon （）.
A.the number of fuel valves
B.the number of cylinders
C.the speed of engine
D.the power of engine
2.單項選擇題The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.
A.the same piston
B.the piston nearby
C.the other pistons
D.the generators on board
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