A.pressure oil
B.pressure water
C.compressed air
D.cooling water
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A.lathed
B.shaped
C.shrunk
D.developed
A.the number of fuel valves
B.the number of cylinders
C.the speed of engine
D.the power of engine
A.the same piston
B.the piston nearby
C.the other pistons
D.the generators on board
A.inside
B.before
C.after
D.against
A.gap
B.clearance
C.radius
D.stroke
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