A.by an fuel valve
B.through an inlet valve
C.with an exhaust valve
D.from an outlet valve
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A.piston crown
B.piston ring groove
C.piston skirt
D.piston ring area
A.one propulsion
B.two propulsions
C.two revolutions
D.one revolution
A.cooling water
B.vapor from the boiler
C.starting air
D.hot gases
A.constant
B.pulse
C.high
D.none of the above
A.piston crown
B.piston groove
C.piston skirt
D.piston ring belt
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